feat: report gateway proxy outcomes

README.md

@@ -21,7 +21,7 @@ Proxy Pool 用 Controller 协调这些变化，并让 Gateway 数据面只消费
 
 - **Gateway**：调用方连接平台，由平台选择上游代理并转发 HTTP 或 HTTPS
   CONNECT。`proxy-gateway` 已装配本地监听、指标探针和控制面 Register/Watch/ACK/
-  Runtime 会话；带凭据 Proxy 分发仍待闭环。
+  Runtime/Outcome 会话；带凭据 Proxy 的分发与当前内存 View 已闭环。
 - **Distribution**：调用方按条件提取真实代理；成功提取即独占消费，不支持归还、
   续租或状态查询。
 - **Admin**：运维人员查询状态、启停 Upstream、切换 Routing，并触发严格配置
@@ -43,7 +43,9 @@ Proxy Pool 用 Controller 协调这些变化，并让 Gateway 数据面只消费
   审计与 Outbox；不保存 Proxy 明细或逐次提取记录。
 - **Gateway 组件**：HTTP 正向代理、HTTPS CONNECT、双向 Tunnel、重试、超时、
   目的地址保护、本地快照存储、容量调度和 Worker 控制面 Register/Watch/ACK/
-  Runtime 会话组件已有实现与定向测试。`SessionSupervisor` 会为可恢复控制面中断执行
+  Runtime/Outcome 会话组件已有实现与定向测试。每次代理尝试只向本地有界队列写入
+  Outcome，微批确认失败会重发同一序列；队列满时丢弃观测样本，不阻塞转发请求。
+  `SessionSupervisor` 会为可恢复控制面中断执行
 有界退避重连。Controller 可向 Worker 下发已归属 Proxy、Gateway Routing 与按引用去重的
 凭据材料快照。Gateway 会将 Routing、Proxy 与凭据原子编译为同一内存 View，并只按当前未过期
   View 匹配请求，并在内存中按 Sequential、Random、Round Robin、Weighted 或 Least
@@ -78,18 +80,17 @@ flowchart LR
 
 ## 当前完成度
 
-截至 **2026-07-31**，实施计划检查项为 **55 / 74（74.3%）**。详情见
+截至 **2026-07-31**，实施计划检查项为 **56 / 74（75.7%）**。详情见
 [实施计划](docs/development/implementation-plan.md)和
 [交付完成度审计](docs/requirements/completion-audit.md)。
 
 - **已完成**：严格配置、Provider 获取与协调、Redis 活动池、Distribution 原子
   提取与限流、Controller 的 Admin/Distribution/Metrics 监听，以及 PostgreSQL
   管理状态；WorkerControlPlane 的 Register、Snapshot ACK、Runtime 心跳接收和
-  Redis 会话栅栏。
+  Redis 会话栅栏，以及 Gateway Outcome 上报的有界队列、序列确认与重试。
-- **部分完成**：Gateway Outcome 上报、Checker 调度与健康状态链、Docker Compose/
+- **部分完成**：Checker 调度与健康状态链、Docker Compose/
   Kubernetes 运行时 mTLS Overlay，以及 protobuf 契约。
-- **待完成**：Outcome 上报、Checker 调度与健康状态链，
+- **待完成**：Checker 调度与健康状态链，以及 loadgen 和代表性集群压测。
-  以及 loadgen 和代表性集群压测。
 
 检查项数量不等于生产就绪度。静态部署清单与 protobuf descriptor 验证也不代表
 端到端拓扑已经完成；`100,000 QPS` 仍只是待验证的集群设计目标。

docs/api/control-plane.md

@@ -35,10 +35,13 @@ Gateway 已将该 payload 编译并原子发布到与 Proxy 相同版本的本
 当前未过期 View；派发器已按五种策略从该 View 选择上游，且在 Proxy 容量耗尽时只在该
 View 的其余候选中回退。`wait_timeout` 随 `on_unavailable=WAIT` 下发并在 Gateway 作为有界
 本地容量等待使用；`DIRECT` 仍先经过 TargetPolicy 再建立 HTTP/CONNECT 直连。`proxy-gateway`
-已装配 Register/Watch/ACK/Runtime 会话、HTTP 代理监听和 Snapshot 就绪探针；控制面中断时
+已装配 Register/Watch/ACK/Runtime/Outcome 会话、HTTP 代理监听和 Snapshot 就绪探针；控制面中断时
-保持进程运行并以有界退避重连，未取得有效 Snapshot 的 Worker 不会 Ready。增量、带凭据
+保持进程运行并以有界退避重连，未取得有效 Snapshot 的 Worker 不会 Ready。`ReportOutcomes`
-Outcome 与 Checker 闭环尚未实现。`ReportOutcomes` 仍明确返回 `Unimplemented`；
+已实现为客户端流：Controller 校验流内固定的 Worker/Session 身份，对每个批次以
-`100,000 QPS` 仍是未验证的设计目标。
+`(session_id, sequence, SHA-256)` 建立 Redis 原子栅栏，并只返回最后确认的序列。
+Redis 只保留每个当前会话的一条序列和摘要；原始 Outcome、代理明细与逐请求记录均不写入
+Redis 或 PostgreSQL。Gateway 只将结果写入本地有界队列，队列满时丢弃样本，不等待控制面
+或存储。Checker 闭环尚未实现；`100,000 QPS` 仍是未验证的设计目标。
 
 `WatchSnapshots` 建立时校验当前 session；每次签发快照引用时也把 `session_id`
 交给 Redis 原子校验。重复 Register 会同时清除旧 Runtime 和已签发引用，因此迟到的
@@ -137,8 +140,15 @@ Outcome 按 Worker 单调 `sequence` 批量上报。Controller 返回已接受
 - `TUNNEL`：隧道建立后结束或失败。
 
 Outcome 是 Observation，不直接让 Worker 修改 Redis 活动池状态，也不创建
-PostgreSQL Proxy 明细。异步上报队列必须有界；队列满时丢弃低价值样本并计
+PostgreSQL Proxy 明细。Gateway 将每次尝试写入进程内有界队列，当前默认容量为
-指标，不能反压 Gateway 热路径。
+`65536` 个事件，单批最多为 `min(512, maxRuntimeCounters)`；一次 ReportOutcomes RPC
+最多合并 16 个已就绪批次。队列满时只递增本地丢弃计数，不反压 Gateway 热路径。
+
+同一 session 内，Controller 仅接受递增 `sequence`；相同序列且摘要一致视为幂等
+重放，相同序列且摘要不同返回 `AlreadyExists`，较小序列返回 `Aborted`。Gateway 在
+未收到确认时保留并重发完全相同的批次。暂态传输错误在当前 session 内按有上限的
+退避重试；会话栅栏错误交由 session supervisor 重建 session。栅栏随 session 替换
+或过期清理，因此长期在线 Worker 不会因独立 Outcome TTL 接受旧序列。
 
 ## 6. Checker 任务
 

docs/configuration/reference.md

@@ -190,6 +190,11 @@ Gateway 连接 Controller 时使用独立启动参数而非 `controlPlane.listen
 模板保持 `controlPlane.enabled: false`，环境 Overlay 挂载 mTLS 证书并启用后才可启动
 Gateway。
 
+`maxRuntimeCounters` 同时限制单个 Runtime 报告和单个 Outcome 批次的条目数。Gateway
+在本地维护容量为 `65536` 的非阻塞 Outcome 队列，默认微批上限为 `512`，实际取二者中
+较小值；该队列与其序列确认状态仅存在于 Gateway 进程内。Controller 的 Redis 状态只保存
+当前 Worker session 的最后确认序列和摘要，PostgreSQL 不保存 Outcome、代理明细或逐请求记录。
+
 ## 5. Gateway
 
 ```yaml

docs/development/implementation-plan.md

@@ -223,7 +223,7 @@ payload 已按配置顺序和 Admin revision/current 状态发布并覆盖 check
 Proxy 原子编译为同版本 View，动态 Router 只匹配该未过期 View。派发器的五种上游选择已
 接入该 View，并在容量耗尽时在同版本候选中回退；`onUnavailable` 的 reject、wait 与 direct
 已接入 Gateway；`proxy-gateway` 已装配本地 HTTP/Metrics 监听、快照就绪探针和
-控制面重连与快照凭据分发，Outcome 上报仍未实现。
+控制面重连与快照凭据分发，以及有界 Outcome 上报、序列确认和精确重试。
 
 已新增公用 `domain/activitypool` 契约及并发安全内存参考实现，Provider
 Reconciler 通过 `UpsertFetched` 写入带供应商 TTL 和分配安全余量的批次；已覆盖
@@ -261,7 +261,8 @@ Controller 多副本共享同一计数。Client 身份只以 SHA-256 摘要进
 Gateway 请求热路径仍只使用本地准入，不增加 Redis/PostgreSQL 调用。
 WorkerControlPlane gRPC 接收端、session 签发/心跳、Snapshot ACK 账本、基础
 Snapshot 流、Gateway 会话客户端与快照凭据分发已完成；权威 Proxy/Routing 发布、
-Outcome 和健康执行链仍待完成，因此 Task 10 尚未全部完成。
+Outcome 上报已完成为有界队列、批次序列/摘要栅栏和确认重试；健康执行链仍待完成，
+因此 Task 10 尚未全部完成。
 
 ## Task 11: Checker and Health Reducer
 

docs/operations/runbook.md

@@ -3,6 +3,9 @@
 ## 1. 运行边界
 
 - Gateway 是数据面，正常请求热路径不访问 PostgreSQL、Redis 或 Provider。
+- Gateway 的 Proxy Outcome 仅进入进程内有界队列；Controller 只维护当前 session
+  的最后确认序列和摘要，原始 Outcome 不写入 Redis 或 PostgreSQL。队列满时丢弃
+  观测样本，代理转发和 Redis session TTL 不受影响。
 - Controller 编排 Fetch、生命周期、所有权、Snapshot 与 Extract；多个副本只有
   一个 Provider 逻辑 Leader。短效 Proxy 明细只存在于 Redis TTL 活动池和节点
   内存，可由 Provider 重建。

docs/requirements/completion-audit.md

@@ -38,7 +38,7 @@
 - `CAP-001 / GW 热路径边界`：本地 Dispatch 条件过滤与原子容量预留。
 - `GW-*`：HTTP 正向代理、HTTPS CONNECT、双向 Tunnel、超时、重试、保护链与
   优雅停机 Handler 已实现并通过定向测试。`proxy-gateway` 已装配本地 HTTP/Metrics
-  监听、快照就绪探针、显式控制面拨号和 Register/Watch/ACK/Runtime 会话；本地 gRPC
+  监听、快照就绪探针、显式控制面拨号和 Register/Watch/ACK/Runtime/Outcome 会话；本地 gRPC
   集成测试验证收到有效 Snapshot 后才 Ready，并可完成 direct 路由。
 - `PROVIDER-*`：Provider HTTP Client、严格响应上限、模板解析安全边界、凭据
   引用 Store 与 Reconciler Adapter 已实现。
@@ -56,7 +56,8 @@
 索引构建已归属 Proxy payload，并以租约收紧可用期；凭据材料按引用去重并与 Proxy/
 Routing 一起纳入 Snapshot checksum，仅在 mTLS 和 Gateway 当前内存 View 中处理。Gateway
 Routing payload 已由配置顺序和 Admin 当前状态合成并覆盖 Snapshot checksum，其运行时消费、
-Outcome 和 Checker 尚未闭环。Snapshot 签发在 Redis 中原子匹配当前
+Outcome 已实现为 Gateway 本地有界队列、微批确认重试和 Controller 的 session/sequence/
+摘要 Redis 栅栏；原始事件不落 Redis 或 PostgreSQL。Checker 尚未闭环。Snapshot 签发在 Redis 中原子匹配当前
   `session_id`，重注册会清除旧引用，迟到旧 Stream 不会覆盖新 session。Controller
   在最近成功下发的 Snapshot `valid_until` 到达时关闭流；Gateway 的公用
   `SessionSupervisor` 已实现可恢复错误的有界退避重连。Gateway 会校验并执行 Snapshot
@@ -105,7 +106,7 @@ Controller/Gateway 入口，完整 mTLS 运行时拓扑仍只有静态验证。
    分布式请求额度、Distribution Client 限制和 Provider 状态丢失重建已完成。
 6. Worker 基础网络快照流、Proxy/Gateway Routing/凭据 Snapshot payload、Gateway Snapshot
    客户端和进程装配、同版本 Routing 编译/动态匹配、五种策略上游选择与 reject/wait/direct 已完成；
-   Outcome 上报仍待完成。Redis ownership drain/ACK/过期回收及按 Worker 的可下发索引已完成。
+   Outcome 上报已完成基础观测链；Redis ownership drain/ACK/过期回收及按 Worker 的可下发索引已完成。
 7. Checker 调度、探测器和健康 reducer。
 8. Admin/Distribution 细粒度授权和审计查询；Distribution 分布式限流已完成。
 9. 真实 Compose/Kubernetes 集成、故障演练和代表性集群负载测试。

docs/requirements/traceability.md

@@ -7,8 +7,8 @@
 
 | ID | 最终需求 | 来源 | 验证证据 |
 |---|---|---|---|
-| ARCH-001 | 数据面 Worker 与控制面 Controller 分离 | 1-70 | 包、协议和部署拓扑已分离；Controller 已运行 Worker Register/Watch/ACK/Runtime gRPC，并发布 Proxy/Gateway Routing/按引用去重凭据完整快照；Gateway 已将它们编译为同版本动态 View，并由独立进程维护控制面会话。Checker/Loadgen 构建产物待实现 |
+| ARCH-001 | 数据面 Worker 与控制面 Controller 分离 | 1-70 | 包、协议和部署拓扑已分离；Controller 已运行 Worker Register/Watch/ACK/Runtime/Outcome gRPC，并发布 Proxy/Gateway Routing/按引用去重凭据完整快照；Gateway 已将它们编译为同版本动态 View，并由独立进程维护控制面会话。Checker/Loadgen 构建产物待实现 |
-| ARCH-002 | 热路径只做认证、本地路由和网络转发 | 1-70, 380-430 | Gateway bootstrap 集成测试验证启动期控制面会话与快照就绪，HTTP 请求只走本地 Snapshot/Dispatch；代表性性能剖析待完成 |
+| ARCH-002 | 热路径只做认证、本地路由和网络转发 | 1-70, 380-430 | Gateway bootstrap 集成测试验证启动期控制面会话与快照就绪，HTTP 请求只走本地 Snapshot/Dispatch；Outcome 仅写入有界非阻塞本地队列，代表性性能剖析待完成 |
 | ARCH-003 | Gateway、Distribution、Admin、Metrics 独立入口 | 8904-8958 | Controller 命令已装配 Distribution/Admin/Metrics 三个独立监听及联动停机；Gateway 命令已装配代理与 Metrics 监听，运行时 mTLS 部署 Overlay 待完成 |
 | ARCH-004 | Controller 集中 Provider 获取与切换 | 1403-1580 | Redis Leader、动态 Provider Supervisor 与 Bootstrap 生产装配已完成；Admin disable/reload 驱动取消替换，多副本按权威 HMAC 指纹和 revision 栅栏收敛并拒绝旧配置换主；Routing 切换到 Drain 的编排待完成 |
 | ARCH-005 | 100k QPS 峰值使用多 Worker 集群 | 当前会话 | 未验证设计目标；待代表性集群负载报告 |
@@ -60,6 +60,7 @@
 | GW-003 | CONNECT 建立后不得透明重放 | 221-300 | `handler_test.go` 200 前重试、200 后中继故障不重放、半关闭测试 |
 | GW-004 | Client 认证可关闭，但访问控制、身份识别和限流独立 | 8112-8441 | `protection_test.go`、`bootstrap_test.go` 与入口并发上限测试 |
 | GW-005 | 防私网、回环、链路本地、保留/元数据地址、任意 CONNECT 端口和 DNS Rebinding | 8904-8931 | `policy/target_test.go` 解析前后校验、端口白名单、混合 DNS 结果与已验证 IP 绑定测试 |
+| GW-006 | Proxy Outcome 不反压转发并按会话序列去重 | 当前会话 | `gateway/outcome` 队列溢出与微批测试、`controlplane/outcome_reporter_test.go` 精确重试测试、Worker gRPC 和 Memory/Redis 共享栅栏契约 |
 
 ## Distribution
 

docs/testing/test-strategy.md

@@ -46,7 +46,7 @@
 - Distribution 原子提取后 Gateway 不再分配同一 Proxy。
 - 配置热更新失败保留旧 Revision，成功后新请求使用新 Snapshot。
 
-## 3. 必测的 11 类场景
+## 3. 必测的 12 类场景
 
 1. **并发容量**：1000 协程争用同一 Proxy，始终满足
    `active + reserved <= effectiveMaxConcurrency`。
@@ -68,6 +68,8 @@
     unowned，旧 Snapshot 不可再分配。
 11. **控制面故障**：Redis、PostgreSQL、Controller、Checker 与 Provider 分别
     失效时，行为与 Runbook 一致，Gateway 热路径不被同步依赖拖垮。
+12. **Outcome 栅栏**：队列写入不阻塞转发；同一 session 的相同序列/摘要可重放，
+    相同序列的不同摘要冲突，较小序列拒绝；Session 替换后旧 Worker 结果拒绝。
 
 ## 4. 测试命令
 

internal/adapters/redisactivity/keys.go

@@ -26,6 +26,7 @@ type keyspace struct {
 	workerSnapshotExpiry string
 	workerRuntime        string
 	workerRuntimeExpiry  string
+	workerOutcomes       string
 }
 
 func newKeyspace(namespace string) keyspace {
@@ -48,6 +49,7 @@ func newKeyspace(namespace string) keyspace {
 		workerSnapshotExpiry: prefix + ":worker-snapshot-expiry",
 		workerRuntime:        prefix + ":worker-runtime",
 		workerRuntimeExpiry:  prefix + ":worker-runtime-expiry",
+		workerOutcomes:       prefix + ":worker-outcomes",
 	}
 }
 

internal/adapters/redisactivity/runtime.go

@@ -20,6 +20,7 @@ const (
 	runtimeRecordSnapshot  = "record_snapshot"
 	runtimeAcknowledge     = "acknowledge_snapshot"
 	runtimeReplaceReport   = "replace_report"
+	runtimeRecordOutcomes  = "record_outcomes"
 	runtimeRead            = "read"
 )
 
@@ -84,6 +85,13 @@ type runtimeReportWire struct {
 	Counters        []runtimeCounterWire `json:"counters"`
 }
 
+type runtimeOutcomeReferenceWire struct {
+	Version   int    `json:"version"`
+	WorkerID  string `json:"workerId"`
+	SessionID string `json:"sessionId"`
+	Sequence  string `json:"sequence"`
+}
+
 type runtimeOwnedProxyWire struct {
 	ProxyID        string `json:"proxyId"`
 	WorkerID       string `json:"workerId"`
@@ -103,6 +111,7 @@ var (
 	_ workerruntime.SessionWriter = (*Adapter)(nil)
 	_ workerruntime.ReportWriter  = (*Adapter)(nil)
 	_ workerruntime.RuntimeReader = (*Adapter)(nil)
+	_ workerruntime.OutcomeWriter = (*Adapter)(nil)
 )
 
 func (a *Adapter) CurrentOwnershipEpoch(ctx context.Context) (uint64, error) {
@@ -317,6 +326,48 @@ func (a *Adapter) ReplaceRuntime(ctx context.Context, report workerruntime.Repor
 	}
 }
 
+// RecordOutcomes persists only the monotonically increasing batch fence. The
+// Gateway event payload is deliberately excluded from Redis to keep the data
+// plane hot path bounded and free of per-request storage writes.
+func (a *Adapter) RecordOutcomes(ctx context.Context, reference workerruntime.OutcomeReference) (uint64, error) {
+	if err := validateRuntimeCall(ctx, a); err != nil {
+		return 0, err
+	}
+	normalized, err := workerruntime.NormalizeOutcomeReference(reference)
+	if err != nil {
+		return 0, workerruntime.ErrInvalidOutcome
+	}
+	payload, err := json.Marshal(runtimeOutcomeReferenceWire{
+		Version: runtimeWireVersion, WorkerID: normalized.WorkerID, SessionID: normalized.SessionID,
+		Sequence: strconv.FormatUint(normalized.Sequence, 10),
+	})
+	if err != nil {
+		return 0, workerruntime.ErrInvalidOutcome
+	}
+	reply, err := a.runRuntime(ctx, runtimeRecordOutcomes, 0, payload, hex.EncodeToString(normalized.Digest[:]))
+	if err != nil {
+		return 0, err
+	}
+	switch reply.Status {
+	case scriptOK:
+		accepted, parseErr := strconv.ParseUint(reply.Record, 10, 64)
+		if parseErr != nil || accepted == 0 {
+			return 0, invalidScriptReply("invalid worker outcome reply")
+		}
+		return accepted, nil
+	case scriptInvalid:
+		return 0, workerruntime.ErrInvalidOutcome
+	case scriptStale:
+		return 0, workerruntime.ErrStaleOutcome
+	case scriptConflict:
+		return 0, workerruntime.ErrConflictingOutcome
+	case scriptUnavailable:
+		return 0, workerruntime.ErrStaleSession
+	default:
+		return 0, invalidScriptReply("unexpected worker outcome reply")
+	}
+}
+
 func (a *Adapter) ReadRuntime(ctx context.Context, proxies []workerruntime.OwnedProxy) ([]workerruntime.Snapshot, error) {
 	if err := validateRuntimeCall(ctx, a); err != nil {
 		return nil, err
@@ -403,6 +454,7 @@ func (a *Adapter) runRuntime(
 		a.keys.workerSessions, a.keys.workerSessionExpiry,
 		a.keys.workerSnapshots, a.keys.workerSnapshotExpiry,
 		a.keys.workerRuntime, a.keys.workerRuntimeExpiry, a.keys.owners, a.keys.epoch,
+		a.keys.workerOutcomes,
 	}, operation, ttlMS, a.options.CleanupLimit, string(payload), digest)
 	if err != nil {
 		return runtimeScriptReply{}, err

internal/adapters/redisactivity/runtime_contract_integration_test.go

@@ -20,7 +20,7 @@ func TestRedisWorkerControlStoreContract(t *testing.T) {
 			t.Fatalf("Assign(): %v", err)
 		}
 		return contracttest.Fixture{
-			Store: fixture.Adapter, Reader: fixture.Adapter, TTL: 100 * time.Millisecond,
+			Store: fixture.Adapter, Reader: fixture.Adapter, Outcomes: fixture.Adapter, TTL: 100 * time.Millisecond,
 			Advance: time.Sleep,
 		}
 	})

internal/adapters/redisactivity/scripts/runtime.lua

@@ -6,6 +6,7 @@ local runtime_key = KEYS[5]
 local runtime_expiry_key = KEYS[6]
 local owners_key = KEYS[7]
 local epoch_key = KEYS[8]
+local outcomes_key = KEYS[9]
 
 local operation = ARGV[1]
 local ttl_ms = tonumber(ARGV[2])
@@ -60,6 +61,7 @@ local function cleanup(now)
     for _, worker_id in ipairs(expired_sessions) do
         redis.call('HDEL', sessions_key, worker_id)
         redis.call('HDEL', runtime_key, worker_id)
+        redis.call('HDEL', outcomes_key, worker_id)
         redis.call('ZREM', session_expiry_key, worker_id)
         redis.call('ZREM', runtime_expiry_key, worker_id)
     end
@@ -106,6 +108,13 @@ local function valid_reference(value)
         string.match(value.checksum, '^[0-9a-f]+$') ~= nil
 end
 
+local function valid_outcome(value)
+    return value and value.version == 1 and type(value.workerId) == 'string' and value.workerId ~= '' and
+        type(value.sessionId) == 'string' and value.sessionId ~= '' and valid_uint(value.sequence) and
+        type(value.digest) == 'string' and string.len(value.digest) == 64 and
+        string.match(value.digest, '^[0-9a-f]+$') ~= nil
+end
+
 local function compare_reference(left, right)
     local epoch_order = compare_uint(left.ownershipEpoch, right.ownershipEpoch)
     if epoch_order ~= 0 then
@@ -148,6 +157,7 @@ if operation == 'open_session' then
     end
     redis.call('HDEL', runtime_key, session.workerId)
     redis.call('ZREM', runtime_expiry_key, session.workerId)
+    redis.call('HDEL', outcomes_key, session.workerId)
     redis.call('HDEL', snapshots_key, session.workerId)
     redis.call('ZREM', snapshot_expiry_key, session.workerId)
     session.expiresAtMs = now + ttl_ms
@@ -301,10 +311,12 @@ if operation == 'replace_session' then
         if epoch_order > 0 or version_order > 0 then
             redis.call('HDEL', runtime_key, session.workerId)
             redis.call('ZREM', runtime_expiry_key, session.workerId)
+            redis.call('HDEL', outcomes_key, session.workerId)
         end
     else
         redis.call('HDEL', runtime_key, session.workerId)
         redis.call('ZREM', runtime_expiry_key, session.workerId)
+        redis.call('HDEL', outcomes_key, session.workerId)
     end
     session.expiresAtMs = now + ttl_ms
     redis.call('HSET', sessions_key, session.workerId, cjson.encode(session))
@@ -312,6 +324,39 @@ if operation == 'replace_session' then
     return reply('ok')
 end
 
+if operation == 'record_outcomes' then
+    if type(digest) ~= 'string' or string.len(digest) ~= 64 or
+        string.match(digest, '^[0-9a-f]+$') == nil then
+        return reply('invalid')
+    end
+    local reference = decode_table(payload)
+    if not reference or reference.version ~= 1 or type(reference.workerId) ~= 'string' or reference.workerId == '' or
+        type(reference.sessionId) ~= 'string' or reference.sessionId == '' or not valid_uint(reference.sequence) then
+        return reply('invalid')
+    end
+    local session = decode_table(redis.call('HGET', sessions_key, reference.workerId))
+    if not valid_session(session) or session.workerId ~= reference.workerId or session.sessionId ~= reference.sessionId or
+        type(session.expiresAtMs) ~= 'number' or session.expiresAtMs <= now then
+        return reply('unavailable')
+    end
+    local current = decode_table(redis.call('HGET', outcomes_key, reference.workerId))
+    if valid_outcome(current) and current.workerId == reference.workerId and current.sessionId == reference.sessionId then
+        local ordering = compare_uint(reference.sequence, current.sequence)
+        if ordering < 0 then
+            return reply('stale')
+        end
+        if ordering == 0 then
+            if current.digest == digest then
+                return reply('ok', nil, current.sequence)
+            end
+            return reply('conflict')
+        end
+    end
+    reference.digest = digest
+    redis.call('HSET', outcomes_key, reference.workerId, cjson.encode(reference))
+    return reply('ok', nil, reference.sequence)
+end
+
 if operation == 'replace_report' then
     if not ttl_ms or ttl_ms <= 0 or type(digest) ~= 'string' or digest == '' then
         return reply('invalid')

internal/controller/worker/grpc_handler.go

@@ -4,9 +4,11 @@ import (
 	"context"
 	"crypto/sha256"
 	"errors"
+	"io"
 	"time"
 
 	controlplanev1 "proxy-pool/gen/controlplane/v1"
+	"proxy-pool/internal/domain/outcome"
 	"proxy-pool/internal/domain/workerruntime"
 
 	"google.golang.org/grpc"
@@ -197,6 +199,84 @@ func (handler *GRPCHandler) ReportRuntime(ctx context.Context, request *controlp
 	}, nil
 }
 
+func (handler *GRPCHandler) ReportOutcomes(stream grpc.ClientStreamingServer[controlplanev1.OutcomeBatch, controlplanev1.ReportOutcomesResponse]) error {
+	if stream == nil || handler == nil || handler.service == nil || handler.identity == nil {
+		return grpcError(ErrInvalidCommand)
+	}
+	var workerID, sessionID string
+	var accepted uint64
+	batches := 0
+	for {
+		request, err := stream.Recv()
+		if errors.Is(err, io.EOF) {
+			if workerID == "" {
+				return grpcError(ErrInvalidCommand)
+			}
+			return stream.SendAndClose(&controlplanev1.ReportOutcomesResponse{AcceptedThroughSequence: accepted})
+		}
+		if err != nil {
+			return err
+		}
+		if batches == outcome.MaxBatchesPerStream {
+			return grpcError(ErrInvalidCommand)
+		}
+		batch, err := decodeOutcomeBatch(request)
+		if err != nil {
+			return grpcError(err)
+		}
+		if workerID == "" {
+			if err := handler.authorize(stream.Context(), batch.WorkerID); err != nil {
+				return err
+			}
+			workerID, sessionID = batch.WorkerID, batch.SessionID
+		} else if batch.WorkerID != workerID || batch.SessionID != sessionID {
+			return grpcError(ErrInvalidCommand)
+		}
+		accepted, err = handler.service.ReportOutcomes(stream.Context(), batch)
+		if err != nil {
+			return grpcError(err)
+		}
+		batches++
+	}
+}
+
+func decodeOutcomeBatch(request *controlplanev1.OutcomeBatch) (outcome.Batch, error) {
+	if request == nil {
+		return outcome.Batch{}, ErrInvalidCommand
+	}
+	events := make([]outcome.Event, len(request.GetOutcomes()))
+	for index, item := range request.GetOutcomes() {
+		if item == nil || item.GetLatency() == nil || item.GetLatency().CheckValid() != nil ||
+			item.GetObservedAt() == nil || item.GetObservedAt().CheckValid() != nil {
+			return outcome.Batch{}, ErrInvalidCommand
+		}
+		stage, ok := decodeOutcomeStage(item.GetStage())
+		if !ok {
+			return outcome.Batch{}, ErrInvalidCommand
+		}
+		events[index] = outcome.Event{
+			ProxyID: item.GetProxyId(), RoutingName: item.GetRoutingName(), Stage: stage, Success: item.GetSuccess(),
+			ErrorClass: outcome.ErrorClass(item.GetErrorClass()), Latency: item.GetLatency().AsDuration(), ObservedAt: item.GetObservedAt().AsTime(),
+		}
+	}
+	return outcome.Batch{WorkerID: request.GetWorkerId(), SessionID: request.GetSessionId(), Sequence: request.GetSequence(), Events: events}, nil
+}
+
+func decodeOutcomeStage(stage controlplanev1.OutcomeStage) (outcome.Stage, bool) {
+	switch stage {
+	case controlplanev1.OutcomeStage_OUTCOME_STAGE_DIAL:
+		return outcome.StageDial, true
+	case controlplanev1.OutcomeStage_OUTCOME_STAGE_PROXY_HANDSHAKE:
+		return outcome.StageProxyHandshake, true
+	case controlplanev1.OutcomeStage_OUTCOME_STAGE_RESPONSE_HEADERS:
+		return outcome.StageResponseHeaders, true
+	case controlplanev1.OutcomeStage_OUTCOME_STAGE_TUNNEL:
+		return outcome.StageTunnel, true
+	default:
+		return outcome.StageUnspecified, false
+	}
+}
+
 func (handler *GRPCHandler) authorize(ctx context.Context, workerID string) error {
 	if err := handler.identity.Authorize(ctx, workerID); err != nil {
 		return status.Error(codes.PermissionDenied, "worker identity is not authorized")
@@ -210,7 +290,8 @@ func grpcError(err error) error {
 		return status.Error(codes.Canceled, "worker control request canceled")
 	case errors.Is(err, context.DeadlineExceeded):
 		return status.Error(codes.DeadlineExceeded, "worker control request deadline exceeded")
-	case errors.Is(err, ErrInvalidCommand), errors.Is(err, workerruntime.ErrInvalidReport),
+	case errors.Is(err, ErrInvalidCommand), errors.Is(err, outcome.ErrInvalidBatch), errors.Is(err, workerruntime.ErrInvalidReport),
+		errors.Is(err, workerruntime.ErrInvalidOutcome),
 		errors.Is(err, workerruntime.ErrInvalidAcknowledgement), errors.Is(err, workerruntime.ErrInvalidSnapshotReference):
 		return status.Error(codes.InvalidArgument, "invalid worker control request")
 	case errors.Is(err, ErrProtocolVersion):
@@ -225,6 +306,10 @@ func grpcError(err error) error {
 		return status.Error(codes.Aborted, "worker runtime sequence is stale")
 	case errors.Is(err, workerruntime.ErrConflictingReport):
 		return status.Error(codes.AlreadyExists, "worker runtime sequence conflicts")
+	case errors.Is(err, workerruntime.ErrStaleOutcome):
+		return status.Error(codes.Aborted, "worker outcome sequence is stale")
+	case errors.Is(err, workerruntime.ErrConflictingOutcome):
+		return status.Error(codes.AlreadyExists, "worker outcome sequence conflicts")
 	default:
 		return status.Error(codes.Unavailable, "worker control plane unavailable")
 	}

internal/controller/worker/grpc_handler_test.go

@@ -8,12 +8,15 @@ import (
 	"time"
 
 	controlplanev1 "proxy-pool/gen/controlplane/v1"
+	"proxy-pool/internal/domain/outcome"
 	"proxy-pool/internal/domain/workerruntime"
 
 	"google.golang.org/grpc"
 	"google.golang.org/grpc/codes"
 	"google.golang.org/grpc/status"
 	"google.golang.org/grpc/test/bufconn"
+	"google.golang.org/protobuf/proto"
+	"google.golang.org/protobuf/types/known/durationpb"
 	"google.golang.org/protobuf/types/known/timestamppb"
 )
 
@@ -45,7 +48,7 @@ func TestGRPCHandlerMapsWorkerRequests(t *testing.T) {
 	}
 }
 
-func TestGRPCHandlerMapsErrorsAndLeavesStreamsUnimplemented(t *testing.T) {
+func TestGRPCHandlerMapsErrorsAndLeavesSnapshotStreamUnimplemented(t *testing.T) {
 	service := &grpcServiceStub{registerErr: ErrProtocolVersion}
 	client, cleanup := grpcWorkerClient(t, service, allowIdentity{})
 	defer cleanup()
@@ -58,11 +61,88 @@ func TestGRPCHandlerMapsErrorsAndLeavesStreamsUnimplemented(t *testing.T) {
 	if err != nil || status.Code(streamErr) != codes.Unimplemented {
 		t.Fatalf("WatchSnapshots() = %v, %v", err, streamErr)
 	}
-	outcomes, err := client.ReportOutcomes(context.Background())
-	_, outcomesErr := outcomes.CloseAndRecv()
-	if err != nil || status.Code(outcomesErr) != codes.Unimplemented {
-		t.Fatalf("ReportOutcomes() = %v, %v", err, outcomesErr)
 }
+
+func TestGRPCHandlerReportsOutcomeStream(t *testing.T) {
+	service := &grpcServiceStub{}
+	client, cleanup := grpcWorkerClient(t, service, allowIdentity{})
+	defer cleanup()
+	stream, err := client.ReportOutcomes(context.Background())
+	if err != nil {
+		t.Fatalf("ReportOutcomes() = %v", err)
+	}
+	if err := stream.Send(&controlplanev1.OutcomeBatch{
+		WorkerId: "worker-a", SessionId: "session-a", Sequence: 3,
+		Outcomes: []*controlplanev1.ProxyOutcome{{
+			ProxyId: "proxy-a", RoutingName: "route-a", Stage: controlplanev1.OutcomeStage_OUTCOME_STAGE_DIAL,
+			Success: false, ErrorClass: "timeout", Latency: durationpb.New(25 * time.Millisecond), ObservedAt: timestamppb.New(time.Now()),
+		}},
+	}); err != nil {
+		t.Fatalf("Send() = %v", err)
+	}
+	response, err := stream.CloseAndRecv()
+	if err != nil || response.GetAcceptedThroughSequence() != 3 || service.outcome.Sequence != 3 ||
+		service.outcome.Events[0].ErrorClass != outcome.ErrorClassTimeout {
+		t.Fatalf("CloseAndRecv() = %+v, %v; outcome = %+v", response, err, service.outcome)
+	}
+}
+
+func TestGRPCHandlerFencesOutcomesThroughWorkerService(t *testing.T) {
+	now := time.Date(2026, 7, 31, 12, 0, 0, 0, time.UTC)
+	store, err := workerruntime.NewMemoryStore(func() time.Time { return now })
+	if err != nil {
+		t.Fatalf("NewMemoryStore() = %v", err)
+	}
+	service, err := NewService(store, Options{
+		ProtocolVersion: 1, HeartbeatInterval: time.Second, SessionTTL: 3 * time.Second,
+		MaxStaleAge: time.Second, MaxRuntimeCounters: 4,
+		SessionID: func() (string, error) { return "session-a", nil },
+	})
+	if err != nil {
+		t.Fatalf("NewService() = %v", err)
+	}
+	client, cleanup := grpcWorkerClient(t, service, allowIdentity{})
+	defer cleanup()
+	registered, err := client.RegisterWorker(context.Background(), &controlplanev1.RegisterWorkerRequest{
+		WorkerId: "worker-a", InstanceId: "instance-a", Zone: "zone-a", SupportedProtocolVersion: 1,
+	})
+	if err != nil || registered.GetSessionId() != "session-a" {
+		t.Fatalf("RegisterWorker() = %+v, %v", registered, err)
+	}
+	batch := &controlplanev1.OutcomeBatch{
+		WorkerId: "worker-a", SessionId: "session-a", Sequence: 1,
+		Outcomes: []*controlplanev1.ProxyOutcome{{
+			ProxyId: "proxy-a", Stage: controlplanev1.OutcomeStage_OUTCOME_STAGE_DIAL, Success: true,
+			Latency: durationpb.New(time.Millisecond), ObservedAt: timestamppb.New(now),
+		}},
+	}
+	if accepted, err := reportOutcomeBatch(context.Background(), client, batch); err != nil || accepted != 1 {
+		t.Fatalf("ReportOutcomes(first) = %d, %v", accepted, err)
+	}
+	if accepted, err := reportOutcomeBatch(context.Background(), client, batch); err != nil || accepted != 1 {
+		t.Fatalf("ReportOutcomes(replay) = %d, %v", accepted, err)
+	}
+	conflicting := proto.Clone(batch).(*controlplanev1.OutcomeBatch)
+	conflicting.Outcomes[0].Success = false
+	conflicting.Outcomes[0].ErrorClass = "dial"
+	if _, err := reportOutcomeBatch(context.Background(), client, conflicting); status.Code(err) != codes.AlreadyExists {
+		t.Fatalf("ReportOutcomes(conflict) code = %s, want AlreadyExists; error=%v", status.Code(err), err)
+	}
+}
+
+func reportOutcomeBatch(ctx context.Context, client controlplanev1.WorkerControlPlaneClient, batch *controlplanev1.OutcomeBatch) (uint64, error) {
+	stream, err := client.ReportOutcomes(ctx)
+	if err != nil {
+		return 0, err
+	}
+	if err := stream.Send(batch); err != nil {
+		return 0, err
+	}
+	response, err := stream.CloseAndRecv()
+	if err != nil {
+		return 0, err
+	}
+	return response.GetAcceptedThroughSequence(), nil
 }
 
 func TestGRPCHandlerStreamsIssuedFullSnapshots(t *testing.T) {
@@ -166,6 +246,9 @@ type grpcServiceStub struct {
 	acknowledgeErr  error
 	report          workerruntime.Report
 	reportErr       error
+	outcome         outcome.Batch
+	outcomeAccepted uint64
+	outcomeErr      error
 	issued          workerruntime.SnapshotReference
 	issuedSessionID string
 	validateErr     error
@@ -195,6 +278,13 @@ func (stub *grpcServiceStub) ReportRuntime(_ context.Context, report workerrunti
 	stub.report = report
 	return RuntimeDecision{AcceptedOwnershipEpoch: 9}, stub.reportErr
 }
+func (stub *grpcServiceStub) ReportOutcomes(_ context.Context, batch outcome.Batch) (uint64, error) {
+	stub.outcome = batch
+	if stub.outcomeAccepted == 0 {
+		stub.outcomeAccepted = batch.Sequence
+	}
+	return stub.outcomeAccepted, stub.outcomeErr
+}
 
 type allowIdentity struct{}
 

internal/controller/worker/service.go

@@ -8,6 +8,7 @@ import (
 	"errors"
 	"time"
 
+	"proxy-pool/internal/domain/outcome"
 	ownershipDomain "proxy-pool/internal/domain/ownership"
 	"proxy-pool/internal/domain/workerruntime"
 	platformCredentials "proxy-pool/internal/platform/credentials"
@@ -71,6 +72,7 @@ type Service interface {
 	IssueSnapshot(context.Context, string, workerruntime.SnapshotReference) error
 	Acknowledge(context.Context, SnapshotAcknowledgement) error
 	ReportRuntime(context.Context, workerruntime.Report) (RuntimeDecision, error)
+	ReportOutcomes(context.Context, outcome.Batch) (uint64, error)
 }
 
 func (service *service) CurrentOwnershipEpoch(ctx context.Context) (uint64, error) {
@@ -119,6 +121,7 @@ func (service *service) IssueSnapshot(ctx context.Context, sessionID string, ref
 
 type service struct {
 	store     workerruntime.ControlStore
+	outcomes  workerruntime.OutcomeWriter
 	options   Options
 	snapshots SnapshotSource
 }
@@ -133,6 +136,7 @@ func NewService(store workerruntime.ControlStore, options Options) (Service, err
 		options.SessionID = randomSessionID
 	}
 	result := &service{store: store, options: options}
+	result.outcomes, _ = store.(workerruntime.OutcomeWriter)
 	if options.SnapshotReader != nil {
 		var routing []RoutingSource
 		if options.RoutingSource != nil {
@@ -252,6 +256,31 @@ func (service *service) ReportRuntime(ctx context.Context, report workerruntime.
 	return RuntimeDecision{AcceptedOwnershipEpoch: epoch}, nil
 }
 
+// ReportOutcomes records only a batch digest and sequence fence. Raw Gateway
+// observations are intentionally not persisted by the control plane.
+func (service *service) ReportOutcomes(ctx context.Context, batch outcome.Batch) (uint64, error) {
+	if ctx == nil {
+		return 0, ErrInvalidCommand
+	}
+	if err := ctx.Err(); err != nil {
+		return 0, err
+	}
+	normalized, digest, err := outcome.NormalizeBatch(batch, service.options.MaxRuntimeCounters)
+	if err != nil {
+		return 0, errors.Join(ErrInvalidCommand, err)
+	}
+	if service.outcomes == nil {
+		return 0, ErrUnavailable
+	}
+	accepted, err := service.outcomes.RecordOutcomes(ctx, workerruntime.OutcomeReference{
+		WorkerID: normalized.WorkerID, SessionID: normalized.SessionID, Sequence: normalized.Sequence, Digest: digest,
+	})
+	if err != nil {
+		return 0, classifyStoreError(err)
+	}
+	return accepted, nil
+}
+
 func randomSessionID() (string, error) {
 	var value [16]byte
 	if _, err := rand.Read(value[:]); err != nil {
@@ -266,8 +295,10 @@ func classifyStoreError(err error) error {
 	}
 	if errors.Is(err, context.Canceled) || errors.Is(err, context.DeadlineExceeded) ||
 		errors.Is(err, workerruntime.ErrInvalidSession) || errors.Is(err, workerruntime.ErrInvalidReport) ||
+		errors.Is(err, workerruntime.ErrInvalidOutcome) ||
 		errors.Is(err, workerruntime.ErrInvalidAcknowledgement) || errors.Is(err, workerruntime.ErrStaleSession) ||
 		errors.Is(err, workerruntime.ErrStaleReport) || errors.Is(err, workerruntime.ErrConflictingReport) ||
+		errors.Is(err, workerruntime.ErrStaleOutcome) || errors.Is(err, workerruntime.ErrConflictingOutcome) ||
 		errors.Is(err, workerruntime.ErrSnapshotMismatch) || errors.Is(err, workerruntime.ErrStaleAcknowledgement) {
 		return err
 	}

internal/controller/worker/service_test.go

@@ -7,6 +7,7 @@ import (
 	"testing"
 	"time"
 
+	"proxy-pool/internal/domain/outcome"
 	"proxy-pool/internal/domain/workerruntime"
 )
 
@@ -51,6 +52,13 @@ func TestServiceRegistersAcknowledgesAndReportsRuntime(t *testing.T) {
 	if err != nil || decision.RequireFullSnapshot || decision.AcceptedOwnershipEpoch != registered.OwnershipEpoch {
 		t.Fatalf("ReportRuntime() = %+v, %v", decision, err)
 	}
+	accepted, err := service.ReportOutcomes(context.Background(), outcome.Batch{
+		WorkerID: "worker-a", SessionID: registered.SessionID, Sequence: 1,
+		Events: []outcome.Event{{ProxyID: "proxy-a", Stage: outcome.StageDial, Success: true, ObservedAt: now}},
+	})
+	if err != nil || accepted != 1 {
+		t.Fatalf("ReportOutcomes() = %d, %v", accepted, err)
+	}
 	decision, err = service.ReportRuntime(context.Background(), workerruntime.Report{
 		WorkerID: "worker-a", SessionID: registered.SessionID, Sequence: 2,
 		SnapshotVersion: 8, OwnershipEpoch: registered.OwnershipEpoch, ObservedAt: now,

internal/domain/outcome/outcome.go

@@ -0,0 +1,110 @@
+package outcome
+
+import (
+	"crypto/sha256"
+	"encoding/json"
+	"errors"
+	"regexp"
+	"time"
+)
+
+const (
+	maximumIdentifierBytes = 128
+	MaxBatchesPerStream    = 16
+)
+
+var (
+	ErrInvalidBatch = errors.New("invalid proxy outcome batch")
+	identifier      = regexp.MustCompile(`^[A-Za-z0-9][A-Za-z0-9._:-]{0,127}$`)
+)
+
+// Stage identifies the furthest proxy-processing boundary reached by a
+// request. It is deliberately independent of a particular transport error.
+type Stage uint8
+
+const (
+	StageUnspecified Stage = iota
+	StageDial
+	StageProxyHandshake
+	StageResponseHeaders
+	StageTunnel
+)
+
+// ErrorClass is a bounded category suitable for aggregation and metrics.
+// It must never contain raw connection, target, or credential details.
+type ErrorClass string
+
+const (
+	ErrorClassDial          ErrorClass = "dial"
+	ErrorClassTimeout       ErrorClass = "timeout"
+	ErrorClassProxyResponse ErrorClass = "proxy_response"
+	ErrorClassHandshake     ErrorClass = "handshake"
+	ErrorClassRelay         ErrorClass = "relay"
+	ErrorClassCanceled      ErrorClass = "canceled"
+	ErrorClassInternal      ErrorClass = "internal"
+)
+
+type Event struct {
+	ProxyID     string
+	RoutingName string
+	Stage       Stage
+	Success     bool
+	ErrorClass  ErrorClass
+	Latency     time.Duration
+	ObservedAt  time.Time
+}
+
+type Batch struct {
+	WorkerID  string
+	SessionID string
+	Sequence  uint64
+	Events    []Event
+}
+
+// NormalizeBatch validates one bounded report, deep-copies it, and returns a
+// digest used by the Controller's durable idempotency fence.
+func NormalizeBatch(batch Batch, maximumEvents int) (Batch, [sha256.Size]byte, error) {
+	if !validIdentifier(batch.WorkerID) || !validIdentifier(batch.SessionID) || batch.Sequence == 0 ||
+		maximumEvents <= 0 || len(batch.Events) == 0 || len(batch.Events) > maximumEvents {
+		return Batch{}, [sha256.Size]byte{}, ErrInvalidBatch
+	}
+	normalized := batch
+	normalized.Events = append([]Event(nil), batch.Events...)
+	for index := range normalized.Events {
+		event := &normalized.Events[index]
+		if !validIdentifier(event.ProxyID) || (event.RoutingName != "" && !validIdentifier(event.RoutingName)) ||
+			!validStage(event.Stage) || event.Latency < 0 || event.ObservedAt.IsZero() ||
+			(event.Success && event.ErrorClass != "") || (!event.Success && !validErrorClass(event.ErrorClass)) {
+			return Batch{}, [sha256.Size]byte{}, ErrInvalidBatch
+		}
+		event.ObservedAt = event.ObservedAt.UTC()
+	}
+	payload, err := json.Marshal(normalized)
+	if err != nil {
+		return Batch{}, [sha256.Size]byte{}, ErrInvalidBatch
+	}
+	return normalized, sha256.Sum256(payload), nil
+}
+
+func validIdentifier(value string) bool {
+	return len(value) <= maximumIdentifierBytes && identifier.MatchString(value)
+}
+
+func validStage(stage Stage) bool {
+	switch stage {
+	case StageDial, StageProxyHandshake, StageResponseHeaders, StageTunnel:
+		return true
+	default:
+		return false
+	}
+}
+
+func validErrorClass(class ErrorClass) bool {
+	switch class {
+	case ErrorClassDial, ErrorClassTimeout, ErrorClassProxyResponse, ErrorClassHandshake,
+		ErrorClassRelay, ErrorClassCanceled, ErrorClassInternal:
+		return true
+	default:
+		return false
+	}
+}

internal/domain/outcome/outcome_test.go

@@ -0,0 +1,52 @@
+package outcome
+
+import (
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestNormalizeBatchCanonicalizesAndDigestsOutcomes(t *testing.T) {
+	observedAt := time.Date(2026, 7, 31, 12, 0, 0, 0, time.FixedZone("UTC+8", 8*60*60))
+	normalized, digest, err := NormalizeBatch(Batch{
+		WorkerID: "worker-a", SessionID: "session-a", Sequence: 7,
+		Events: []Event{{
+			ProxyID: "proxy-a", RoutingName: "gateway-default", Stage: StageResponseHeaders,
+			Success: false, ErrorClass: ErrorClassTimeout, Latency: 25 * time.Millisecond, ObservedAt: observedAt,
+		}},
+	}, 4)
+	if err != nil {
+		t.Fatalf("NormalizeBatch(): %v", err)
+	}
+	if normalized.Events[0].ObservedAt.Location() != time.UTC || digest == [32]byte{} {
+		t.Fatalf("normalized outcome = %+v, digest = %x", normalized.Events[0], digest)
+	}
+	_, repeated, err := NormalizeBatch(normalized, 4)
+	if err != nil || digest != repeated {
+		t.Fatalf("repeated NormalizeBatch() digest = %x, %v; want %x", repeated, err, digest)
+	}
+}
+
+func TestNormalizeBatchRejectsUnboundedOrUnsafeInput(t *testing.T) {
+	now := time.Now()
+	valid := Event{ProxyID: "proxy-a", Stage: StageDial, Success: false, ErrorClass: ErrorClassDial, ObservedAt: now}
+	tests := []struct {
+		name  string
+		batch Batch
+		limit int
+	}{
+		{name: "missing worker", batch: Batch{SessionID: "session-a", Sequence: 1, Events: []Event{valid}}, limit: 1},
+		{name: "zero sequence", batch: Batch{WorkerID: "worker-a", SessionID: "session-a", Events: []Event{valid}}, limit: 1},
+		{name: "empty batch", batch: Batch{WorkerID: "worker-a", SessionID: "session-a", Sequence: 1}, limit: 1},
+		{name: "exceeds limit", batch: Batch{WorkerID: "worker-a", SessionID: "session-a", Sequence: 1, Events: []Event{valid, valid}}, limit: 1},
+		{name: "success with error", batch: Batch{WorkerID: "worker-a", SessionID: "session-a", Sequence: 1, Events: []Event{{ProxyID: "proxy-a", Stage: StageDial, Success: true, ErrorClass: ErrorClassDial, ObservedAt: now}}}, limit: 1},
+		{name: "unknown error class", batch: Batch{WorkerID: "worker-a", SessionID: "session-a", Sequence: 1, Events: []Event{{ProxyID: "proxy-a", Stage: StageDial, ErrorClass: "raw network failure", ObservedAt: now}}}, limit: 1},
+	}
+	for _, test := range tests {
+		t.Run(test.name, func(t *testing.T) {
+			if _, _, err := NormalizeBatch(test.batch, test.limit); !errors.Is(err, ErrInvalidBatch) {
+				t.Fatalf("NormalizeBatch() error = %v, want ErrInvalidBatch", err)
+			}
+		})
+	}
+}

internal/domain/workerruntime/contract_external_test.go

@@ -17,7 +17,7 @@ func TestMemoryStoreContract(t *testing.T) {
 			t.Fatalf("NewMemoryStore(): %v", err)
 		}
 		return contracttest.Fixture{
-			Store: store, Reader: store, TTL: time.Minute,
+			Store: store, Reader: store, Outcomes: store, TTL: time.Minute,
 			Advance: func(duration time.Duration) { now = now.Add(duration) },
 		}
 	})

internal/domain/workerruntime/contracttest/contract.go

@@ -13,6 +13,7 @@ import (
 type Fixture struct {
 	Store    workerruntime.ControlStore
 	Reader   workerruntime.RuntimeReader
+	Outcomes workerruntime.OutcomeWriter
 	TTL      time.Duration
 	Advance  func(time.Duration)
 }
@@ -25,6 +26,8 @@ func Run(t *testing.T, factory Factory) {
 	t.Run("acknowledged runtime lifecycle", func(t *testing.T) { runLifecycle(t, newFixture(t, factory)) })
 	t.Run("negative acknowledgement fences runtime", func(t *testing.T) { runNegativeAck(t, newFixture(t, factory)) })
 	t.Run("session replacement fences issued snapshots", func(t *testing.T) { runSessionReplacementFence(t, newFixture(t, factory)) })
+	t.Run("outcome sequence fences retries", func(t *testing.T) { runOutcomeFence(t, newFixture(t, factory)) })
+	t.Run("outcome invalid call is a store error", func(t *testing.T) { runOutcomeInvalidCall(t, newFixture(t, factory)) })
 }
 
 func runLifecycle(t *testing.T, fixture Fixture) {
@@ -117,10 +120,57 @@ func runSessionReplacementFence(t *testing.T, fixture Fixture) {
 	}
 }
 
+func runOutcomeFence(t *testing.T, fixture Fixture) {
+	t.Helper()
+	ctx := context.Background()
+	open(t, fixture.Store, fixture.TTL)
+	first := workerruntime.OutcomeReference{
+		WorkerID: "worker-a", SessionID: "session-a", Sequence: 1,
+		Digest: sha256.Sum256([]byte("outcome-1")),
+	}
+	accepted, err := fixture.Outcomes.RecordOutcomes(ctx, first)
+	if err != nil || accepted != first.Sequence {
+		t.Fatalf("RecordOutcomes(first) = %d, %v; want 1, nil", accepted, err)
+	}
+	accepted, err = fixture.Outcomes.RecordOutcomes(ctx, first)
+	if err != nil || accepted != first.Sequence {
+		t.Fatalf("RecordOutcomes(replay) = %d, %v; want 1, nil", accepted, err)
+	}
+	conflicting := first
+	conflicting.Digest = sha256.Sum256([]byte("outcome-conflict"))
+	if _, err := fixture.Outcomes.RecordOutcomes(ctx, conflicting); !errors.Is(err, workerruntime.ErrConflictingOutcome) {
+		t.Fatalf("RecordOutcomes(conflict) = %v, want ErrConflictingOutcome", err)
+	}
+	next := first
+	next.Sequence = 2
+	next.Digest = sha256.Sum256([]byte("outcome-2"))
+	if accepted, err := fixture.Outcomes.RecordOutcomes(ctx, next); err != nil || accepted != next.Sequence {
+		t.Fatalf("RecordOutcomes(next) = %d, %v; want 2, nil", accepted, err)
+	}
+	if _, err := fixture.Outcomes.RecordOutcomes(ctx, first); !errors.Is(err, workerruntime.ErrStaleOutcome) {
+		t.Fatalf("RecordOutcomes(stale) = %v, want ErrStaleOutcome", err)
+	}
+	if err := fixture.Store.OpenSession(ctx, workerruntime.Session{
+		WorkerID: "worker-a", InstanceID: "instance-b", SessionID: "session-b", Zone: "zone-a", ProtocolVersion: 1,
+	}, fixture.TTL); err != nil {
+		t.Fatalf("OpenSession(replacement): %v", err)
+	}
+	if _, err := fixture.Outcomes.RecordOutcomes(ctx, first); !errors.Is(err, workerruntime.ErrStaleSession) {
+		t.Fatalf("RecordOutcomes(old session) = %v, want ErrStaleSession", err)
+	}
+}
+
+func runOutcomeInvalidCall(t *testing.T, fixture Fixture) {
+	t.Helper()
+	if _, err := fixture.Outcomes.RecordOutcomes(nil, workerruntime.OutcomeReference{}); !errors.Is(err, workerruntime.ErrInvalidStore) {
+		t.Fatalf("RecordOutcomes(nil) = %v, want ErrInvalidStore", err)
+	}
+}
+
 func newFixture(t *testing.T, factory Factory) Fixture {
 	t.Helper()
 	fixture := factory(t)
-	if fixture.Store == nil || fixture.Reader == nil || fixture.TTL <= 0 || fixture.Advance == nil {
+	if fixture.Store == nil || fixture.Reader == nil || fixture.Outcomes == nil || fixture.TTL <= 0 || fixture.Advance == nil {
 		t.Fatal("contract fixture is incomplete")
 	}
 	return fixture

internal/domain/workerruntime/memory.go

@@ -14,6 +14,7 @@ type MemoryStore struct {
 	sessions   map[string]memorySession
 	references map[string]memoryReference
 	reports    map[string]memoryReport
+	outcomes   map[string]memoryOutcome
 }
 
 type memorySession struct {
@@ -33,11 +34,16 @@ type memoryReport struct {
 	counters  map[string]Counter
 }
 
+type memoryOutcome struct {
+	value OutcomeReference
+}
+
 var (
 	_ ControlStore  = (*MemoryStore)(nil)
 	_ SessionWriter = (*MemoryStore)(nil)
 	_ ReportWriter  = (*MemoryStore)(nil)
 	_ RuntimeReader = (*MemoryStore)(nil)
+	_ OutcomeWriter = (*MemoryStore)(nil)
 )
 
 func NewMemoryStore(now func() time.Time) (*MemoryStore, error) {
@@ -46,7 +52,7 @@ func NewMemoryStore(now func() time.Time) (*MemoryStore, error) {
 	}
 	return &MemoryStore{
 		now: now, epoch: 1, sessions: make(map[string]memorySession),
-		references: make(map[string]memoryReference), reports: make(map[string]memoryReport),
+		references: make(map[string]memoryReference), reports: make(map[string]memoryReport), outcomes: make(map[string]memoryOutcome),
 	}, nil
 }
 
@@ -85,6 +91,7 @@ func (store *MemoryStore) OpenSession(ctx context.Context, session Session, ttl
 	defer store.mu.Unlock()
 	delete(store.reports, normalized.WorkerID)
 	delete(store.references, normalized.WorkerID)
+	delete(store.outcomes, normalized.WorkerID)
 	store.sessions[normalized.WorkerID] = memorySession{value: normalized, expiresAt: now.Add(ttl)}
 	return nil
 }
@@ -246,12 +253,49 @@ func (store *MemoryStore) ReplaceSession(ctx context.Context, session Session, t
 	ackAdvanced := exists && !identityChanged && !expired && legacySessionAfter(session, current.value)
 	if identityChanged || expired || ackAdvanced {
 		delete(store.reports, session.WorkerID)
+		delete(store.outcomes, session.WorkerID)
 	}
 	session.RuntimeEnabled = true
 	store.sessions[session.WorkerID] = memorySession{value: session, expiresAt: now.Add(ttl)}
 	return nil
 }
 
+func (store *MemoryStore) RecordOutcomes(ctx context.Context, reference OutcomeReference) (uint64, error) {
+	if ctx == nil || store == nil {
+		return 0, ErrInvalidStore
+	}
+	if err := ctx.Err(); err != nil {
+		return 0, err
+	}
+	normalized, err := NormalizeOutcomeReference(reference)
+	if err != nil {
+		return 0, err
+	}
+	now, err := store.currentTime()
+	if err != nil {
+		return 0, err
+	}
+	store.mu.Lock()
+	defer store.mu.Unlock()
+	session, exists := store.sessions[normalized.WorkerID]
+	if !exists || !session.expiresAt.After(now) || session.value.SessionID != normalized.SessionID {
+		return 0, ErrStaleSession
+	}
+	current, exists := store.outcomes[normalized.WorkerID]
+	if exists && current.value.SessionID == normalized.SessionID {
+		switch {
+		case normalized.Sequence < current.value.Sequence:
+			return 0, ErrStaleOutcome
+		case normalized.Sequence == current.value.Sequence && normalized.Digest != current.value.Digest:
+			return 0, ErrConflictingOutcome
+		case normalized.Sequence == current.value.Sequence:
+			return current.value.Sequence, nil
+		}
+	}
+	store.outcomes[normalized.WorkerID] = memoryOutcome{value: normalized}
+	return normalized.Sequence, nil
+}
+
 func (store *MemoryStore) ReplaceRuntime(ctx context.Context, report Report, ttl time.Duration) error {
 	if ctx == nil || store == nil || ttl <= 0 {
 		return ErrInvalidReport

internal/domain/workerruntime/outcome_test.go

@@ -0,0 +1,51 @@
+package workerruntime
+
+import (
+	"context"
+	"crypto/sha256"
+	"errors"
+	"testing"
+	"time"
+)
+
+func TestMemoryStoreFencesOutcomeSequenceBySessionAndDigest(t *testing.T) {
+	now := time.Date(2026, 7, 31, 12, 0, 0, 0, time.UTC)
+	store := newRuntimeStore(t, &now)
+	openControlSession(t, store, "session-a", time.Minute)
+	first := OutcomeReference{
+		WorkerID: "worker-a", SessionID: "session-a", Sequence: 1, Digest: sha256.Sum256([]byte("batch-1")),
+	}
+	accepted, err := store.RecordOutcomes(context.Background(), first)
+	if err != nil || accepted != 1 {
+		t.Fatalf("RecordOutcomes(first) = %d, %v; want 1, nil", accepted, err)
+	}
+	accepted, err = store.RecordOutcomes(context.Background(), first)
+	if err != nil || accepted != 1 {
+		t.Fatalf("RecordOutcomes(replay) = %d, %v; want 1, nil", accepted, err)
+	}
+	conflicting := first
+	conflicting.Digest = sha256.Sum256([]byte("different"))
+	if _, err := store.RecordOutcomes(context.Background(), conflicting); !errors.Is(err, ErrConflictingOutcome) {
+		t.Fatalf("RecordOutcomes(conflicting replay) error = %v, want ErrConflictingOutcome", err)
+	}
+	if _, err := store.RecordOutcomes(context.Background(), OutcomeReference{
+		WorkerID: "worker-a", SessionID: "session-a", Sequence: 0, Digest: first.Digest,
+	}); !errors.Is(err, ErrInvalidOutcome) {
+		t.Fatalf("RecordOutcomes(zero sequence) error = %v, want ErrInvalidOutcome", err)
+	}
+	if _, err := store.RecordOutcomes(context.Background(), OutcomeReference{
+		WorkerID: "worker-a", SessionID: "session-a", Sequence: 2, Digest: sha256.Sum256([]byte("batch-2")),
+	}); err != nil {
+		t.Fatalf("RecordOutcomes(next) error = %v", err)
+	}
+	if _, err := store.RecordOutcomes(context.Background(), OutcomeReference{
+		WorkerID: "worker-a", SessionID: "session-a", Sequence: 1, Digest: first.Digest,
+	}); !errors.Is(err, ErrStaleOutcome) {
+		t.Fatalf("RecordOutcomes(stale) error = %v, want ErrStaleOutcome", err)
+	}
+
+	openControlSession(t, store, "session-b", time.Minute)
+	if _, err := store.RecordOutcomes(context.Background(), first); !errors.Is(err, ErrStaleSession) {
+		t.Fatalf("RecordOutcomes(old session) error = %v, want ErrStaleSession", err)
+	}
+}

internal/domain/workerruntime/runtime.go

@@ -21,6 +21,9 @@ var (
 	ErrStaleSnapshotReference       = errors.New("stale worker snapshot reference")
 	ErrConflictingSnapshotReference = errors.New("conflicting worker snapshot reference")
 	ErrStaleAcknowledgement         = errors.New("stale worker snapshot acknowledgement")
+	ErrInvalidOutcome               = errors.New("invalid worker outcome reference")
+	ErrStaleOutcome                 = errors.New("stale worker outcome sequence")
+	ErrConflictingOutcome           = errors.New("conflicting worker outcome sequence")
 )
 
 type Session struct {
@@ -84,6 +87,15 @@ type Snapshot struct {
 	Fresh    bool
 }
 
+// OutcomeReference is the durable deduplication fence for one Gateway Outcome
+// batch. The event payload itself remains outside the runtime store.
+type OutcomeReference struct {
+	WorkerID  string
+	SessionID string
+	Sequence  uint64
+	Digest    [sha256.Size]byte
+}
+
 type SessionWriter interface {
 	ReplaceSession(context.Context, Session, time.Duration) error
 }
@@ -97,6 +109,10 @@ type ControlStore interface {
 	ReplaceRuntime(context.Context, Report, time.Duration) error
 }
 
+type OutcomeWriter interface {
+	RecordOutcomes(context.Context, OutcomeReference) (uint64, error)
+}
+
 type ReportWriter interface {
 	ReplaceRuntime(context.Context, Report, time.Duration) error
 }

internal/domain/workerruntime/validation.go

@@ -82,6 +82,14 @@ func NormalizeAcknowledgement(acknowledgement SnapshotAcknowledgement) (Snapshot
 	return acknowledgement, nil
 }
 
+func NormalizeOutcomeReference(reference OutcomeReference) (OutcomeReference, error) {
+	if !ValidIdentifier(reference.WorkerID) || !ValidIdentifier(reference.SessionID) || reference.Sequence == 0 ||
+		checksumIsZero(reference.Digest) {
+		return OutcomeReference{}, ErrInvalidOutcome
+	}
+	return reference, nil
+}
+
 // NormalizeReport returns the canonical sparse replacement and its digest.
 func NormalizeReport(report Report) (Report, [sha256.Size]byte, error) {
 	if !ValidIdentifier(report.WorkerID) || !ValidIdentifier(report.SessionID) || report.Sequence == 0 ||

internal/gateway/bootstrap/bootstrap.go

@@ -27,6 +27,7 @@ import (
 	"proxy-pool/internal/domain/workerruntime"
 	"proxy-pool/internal/gateway/controlplane"
 	"proxy-pool/internal/gateway/dispatch"
+	gatewayOutcome "proxy-pool/internal/gateway/outcome"
 	"proxy-pool/internal/gateway/server"
 	"proxy-pool/internal/gateway/snapshot"
 	"proxy-pool/internal/gateway/transport"
@@ -45,6 +46,8 @@ const (
 	defaultReconnectInitialDelay = time.Second
 	defaultReconnectMaxDelay     = 30 * time.Second
 	defaultReconnectJitter       = 20
+	defaultOutcomeQueueCapacity  = 65_536
+	defaultOutcomeBatchSize      = 512
 )
 
 // Options provides process-local settings. ControlPlaneAddress is deliberately
@@ -147,6 +150,13 @@ func newRuntime(ctx context.Context, configuration *config.Config, options Optio
 		return nil, fmt.Errorf("build gateway target policy: %w", err)
 	}
 	proxyTransport := transport.New(transport.Config{}, snapshotCredentialResolver{store: store})
+	outcomes, err := gatewayOutcome.NewQueue(gatewayOutcome.QueueOptions{
+		Capacity: defaultOutcomeQueueCapacity, MaxBatch: min(defaultOutcomeBatchSize, configuration.ControlPlane.MaxRuntimeCounters),
+	})
+	if err != nil {
+		proxyTransport.CloseIdleConnections()
+		return nil, fmt.Errorf("build gateway outcome queue: %w", err)
+	}
 	handler, err := server.New(server.ConfigFromListener(configuration.Gateway), server.Dependencies{
 		Auth:       protection.Auth,
 		Access:     protection.Access,
@@ -155,6 +165,7 @@ func newRuntime(ctx context.Context, configuration *config.Config, options Optio
 		Router:     server.NewSnapshotRouter(store),
 		Dispatcher: dispatch.New(store),
 		Transport:  proxyTransport,
+		Outcomes:   outcomes,
 	})
 	if err != nil {
 		proxyTransport.CloseIdleConnections()
@@ -198,7 +209,12 @@ func newRuntime(ctx context.Context, configuration *config.Config, options Optio
 	if err != nil {
 		return nil, fmt.Errorf("build snapshot watcher: %w", err)
 	}
-	session, err := controlplane.NewSessionRunner(reporter, watcher)
+	outcomeReporter, err := controlplane.NewOutcomeReporter(controlplane.NewGeneratedOutcomeRPCClient(client), outcomes,
+		controlplane.OutcomeReporterOptions{WorkerID: options.WorkerID})
+	if err != nil {
+		return nil, fmt.Errorf("build outcome reporter: %w", err)
+	}
+	session, err := controlplane.NewSessionRunner(reporter, watcher, outcomeReporter)
 	if err != nil {
 		return nil, fmt.Errorf("build control plane session: %w", err)
 	}

internal/gateway/controlplane/outcome_reporter.go

@@ -0,0 +1,254 @@
+package controlplane
+
+import (
+	"context"
+	"errors"
+	"fmt"
+	"sync"
+	"time"
+
+	controlplanev1 "proxy-pool/gen/controlplane/v1"
+	domain "proxy-pool/internal/domain/outcome"
+	"proxy-pool/internal/domain/workerruntime"
+	gatewayOutcome "proxy-pool/internal/gateway/outcome"
+
+	"google.golang.org/grpc/codes"
+	"google.golang.org/grpc/status"
+	"google.golang.org/protobuf/types/known/durationpb"
+	"google.golang.org/protobuf/types/known/timestamppb"
+)
+
+var (
+	ErrInvalidOutcomeReporter = errors.New("invalid gateway outcome reporter")
+	ErrOutcomeUnconfirmed     = errors.New("controller did not confirm gateway outcome batch")
+)
+
+const (
+	outcomeRetryInitialDelay = 100 * time.Millisecond
+	outcomeRetryMaxDelay     = 5 * time.Second
+)
+
+type OutcomeStream interface {
+	Send(*controlplanev1.OutcomeBatch) error
+	CloseAndRecv() (*controlplanev1.ReportOutcomesResponse, error)
+}
+
+type OutcomeRPCClient interface {
+	ReportOutcomes(context.Context) (OutcomeStream, error)
+}
+
+type OutcomeReporterOptions struct {
+	WorkerID               string
+	MaxBatchesPerReportRPC int
+}
+
+type OutcomeReporter struct {
+	client  OutcomeRPCClient
+	queue   *gatewayOutcome.Queue
+	options OutcomeReporterOptions
+
+	mu        sync.Mutex
+	sessionID string
+	sequence  uint64
+	pending   []domain.Batch
+}
+
+func NewOutcomeReporter(client OutcomeRPCClient, queue *gatewayOutcome.Queue, options OutcomeReporterOptions) (*OutcomeReporter, error) {
+	if client == nil || queue == nil || !workerruntime.ValidIdentifier(options.WorkerID) {
+		return nil, ErrInvalidOutcomeReporter
+	}
+	if options.MaxBatchesPerReportRPC <= 0 {
+		options.MaxBatchesPerReportRPC = domain.MaxBatchesPerStream
+	}
+	if options.MaxBatchesPerReportRPC > domain.MaxBatchesPerStream {
+		return nil, ErrInvalidOutcomeReporter
+	}
+	return &OutcomeReporter{client: client, queue: queue, options: options}, nil
+}
+
+// RunRegistered continuously batches local observations for a single
+// Controller session. Transient delivery failures retain the exact pending
+// batches and retry them in the same session with bounded backoff.
+func (reporter *OutcomeReporter) RunRegistered(ctx context.Context, registration Registration) error {
+	if reporter == nil || ctx == nil || !workerruntime.ValidIdentifier(registration.SessionID) {
+		return ErrInvalidOutcomeReporter
+	}
+	reporter.mu.Lock()
+	reporter.sessionID = registration.SessionID
+	reporter.sequence = 0
+	reporter.pending = nil
+	reporter.mu.Unlock()
+	retryDelay := outcomeRetryInitialDelay
+	for {
+		err := reporter.Report(ctx, registration.SessionID)
+		if err == nil {
+			retryDelay = outcomeRetryInitialDelay
+			continue
+		}
+		if ctx.Err() != nil {
+			return ctx.Err()
+		}
+		if terminalOutcomeError(err) {
+			return err
+		}
+		if err := waitOutcomeRetry(ctx, retryDelay); err != nil {
+			return err
+		}
+		retryDelay = nextOutcomeRetryDelay(retryDelay)
+	}
+}
+
+func terminalOutcomeError(err error) bool {
+	if errors.Is(err, ErrInvalidOutcomeReporter) || errors.Is(err, ErrNotRegistered) {
+		return true
+	}
+	switch status.Code(err) {
+	case codes.Aborted, codes.AlreadyExists, codes.FailedPrecondition,
+		codes.InvalidArgument, codes.PermissionDenied, codes.Unauthenticated:
+		return true
+	default:
+		return false
+	}
+}
+
+func waitOutcomeRetry(ctx context.Context, delay time.Duration) error {
+	timer := time.NewTimer(delay)
+	defer timer.Stop()
+	select {
+	case <-ctx.Done():
+		return ctx.Err()
+	case <-timer.C:
+		return nil
+	}
+}
+
+func nextOutcomeRetryDelay(delay time.Duration) time.Duration {
+	if delay >= outcomeRetryMaxDelay/2 {
+		return outcomeRetryMaxDelay
+	}
+	return delay * 2
+}
+
+func (reporter *OutcomeReporter) Report(ctx context.Context, sessionID string) error {
+	if reporter == nil || ctx == nil || !workerruntime.ValidIdentifier(sessionID) {
+		return ErrInvalidOutcomeReporter
+	}
+	if err := ctx.Err(); err != nil {
+		return err
+	}
+	reporter.mu.Lock()
+	defer reporter.mu.Unlock()
+	if reporter.sessionID != sessionID {
+		return ErrNotRegistered
+	}
+	if err := reporter.fillPending(ctx); err != nil {
+		return err
+	}
+	streamCtx, cancel := context.WithCancel(ctx)
+	defer cancel()
+	stream, err := reporter.client.ReportOutcomes(streamCtx)
+	if err != nil {
+		return err
+	}
+	for _, batch := range reporter.pending {
+		request, requestErr := outcomeRequest(batch)
+		if requestErr != nil {
+			return requestErr
+		}
+		if sendErr := stream.Send(request); sendErr != nil {
+			return sendErr
+		}
+	}
+	response, err := stream.CloseAndRecv()
+	if err != nil {
+		return err
+	}
+	last := reporter.pending[len(reporter.pending)-1].Sequence
+	if response == nil || response.GetAcceptedThroughSequence() != last {
+		return ErrOutcomeUnconfirmed
+	}
+	reporter.sequence = last
+	reporter.pending = nil
+	return nil
+}
+
+func (reporter *OutcomeReporter) fillPending(ctx context.Context) error {
+	if len(reporter.pending) == 0 {
+		events, err := reporter.queue.Next(ctx)
+		if err != nil {
+			return err
+		}
+		if err := reporter.append(events); err != nil {
+			return err
+		}
+	}
+	for len(reporter.pending) < reporter.options.MaxBatchesPerReportRPC {
+		events, ok := reporter.queue.TryNext()
+		if !ok {
+			return nil
+		}
+		if err := reporter.append(events); err != nil {
+			return err
+		}
+	}
+	return nil
+}
+
+func (reporter *OutcomeReporter) append(events []domain.Event) error {
+	batch, _, err := domain.NormalizeBatch(domain.Batch{
+		WorkerID: reporter.options.WorkerID, SessionID: reporter.sessionID,
+		Sequence: reporter.sequence + uint64(len(reporter.pending)) + 1, Events: events,
+	}, reporter.queue.MaxBatch())
+	if err != nil {
+		return errors.Join(ErrInvalidOutcomeReporter, err)
+	}
+	reporter.pending = append(reporter.pending, batch)
+	return nil
+}
+
+func outcomeRequest(batch domain.Batch) (*controlplanev1.OutcomeBatch, error) {
+	proxies := make([]*controlplanev1.ProxyOutcome, len(batch.Events))
+	for index, event := range batch.Events {
+		stage, ok := outcomeStage(event.Stage)
+		if !ok {
+			return nil, fmt.Errorf("%w: unknown outcome stage", ErrInvalidOutcomeReporter)
+		}
+		proxies[index] = &controlplanev1.ProxyOutcome{
+			ProxyId: event.ProxyID, RoutingName: event.RoutingName, Stage: stage, Success: event.Success,
+			ErrorClass: string(event.ErrorClass), Latency: durationpb.New(event.Latency), ObservedAt: timestamppb.New(event.ObservedAt),
+		}
+	}
+	return &controlplanev1.OutcomeBatch{
+		WorkerId: batch.WorkerID, SessionId: batch.SessionID, Sequence: batch.Sequence, Outcomes: proxies,
+	}, nil
+}
+
+func outcomeStage(stage domain.Stage) (controlplanev1.OutcomeStage, bool) {
+	switch stage {
+	case domain.StageDial:
+		return controlplanev1.OutcomeStage_OUTCOME_STAGE_DIAL, true
+	case domain.StageProxyHandshake:
+		return controlplanev1.OutcomeStage_OUTCOME_STAGE_PROXY_HANDSHAKE, true
+	case domain.StageResponseHeaders:
+		return controlplanev1.OutcomeStage_OUTCOME_STAGE_RESPONSE_HEADERS, true
+	case domain.StageTunnel:
+		return controlplanev1.OutcomeStage_OUTCOME_STAGE_TUNNEL, true
+	default:
+		return controlplanev1.OutcomeStage_OUTCOME_STAGE_UNSPECIFIED, false
+	}
+}
+
+type generatedOutcomeRPCClient struct {
+	client controlplanev1.WorkerControlPlaneClient
+}
+
+func NewGeneratedOutcomeRPCClient(client controlplanev1.WorkerControlPlaneClient) OutcomeRPCClient {
+	return generatedOutcomeRPCClient{client: client}
+}
+
+func (client generatedOutcomeRPCClient) ReportOutcomes(ctx context.Context) (OutcomeStream, error) {
+	if client.client == nil {
+		return nil, ErrInvalidOutcomeReporter
+	}
+	return client.client.ReportOutcomes(ctx)
+}

internal/gateway/controlplane/outcome_reporter_test.go

@@ -0,0 +1,175 @@
+package controlplane
+
+import (
+	"context"
+	"errors"
+	"sync"
+	"testing"
+	"time"
+
+	controlplanev1 "proxy-pool/gen/controlplane/v1"
+	domain "proxy-pool/internal/domain/outcome"
+	gatewayOutcome "proxy-pool/internal/gateway/outcome"
+)
+
+func TestOutcomeReporterRetriesExactPendingBatchAfterTransportFailure(t *testing.T) {
+	queue, err := gatewayOutcome.NewQueue(gatewayOutcome.QueueOptions{Capacity: 4, MaxBatch: 2})
+	if err != nil {
+		t.Fatalf("NewQueue() = %v", err)
+	}
+	queue.Record(domain.Event{ProxyID: "proxy-a", Stage: domain.StageDial, Success: true, ObservedAt: time.Now()})
+	client := &outcomeClientStub{closeErr: errors.New("connection dropped")}
+	reporter, err := NewOutcomeReporter(client, queue, OutcomeReporterOptions{WorkerID: "worker-a"})
+	if err != nil {
+		t.Fatalf("NewOutcomeReporter() = %v", err)
+	}
+	registration := Registration{SessionID: "session-a"}
+	reporter.sessionID = registration.SessionID
+	if err := reporter.Report(context.Background(), registration.SessionID); !errors.Is(err, client.closeErr) {
+		t.Fatalf("Report(first) = %v, want transport failure", err)
+	}
+	client.closeErr = nil
+	if err := reporter.Report(context.Background(), registration.SessionID); err != nil {
+		t.Fatalf("Report(retry) = %v", err)
+	}
+	if len(client.batches) != 2 || client.batches[0].GetSequence() != 1 || client.batches[1].GetSequence() != 1 ||
+		client.batches[0].GetOutcomes()[0].GetProxyId() != "proxy-a" {
+		t.Fatalf("sent batches = %+v", client.batches)
+	}
+}
+
+func TestOutcomeReporterCombinesAvailableBatchesAndRequiresConfirmation(t *testing.T) {
+	queue, err := gatewayOutcome.NewQueue(gatewayOutcome.QueueOptions{Capacity: 8, MaxBatch: 1})
+	if err != nil {
+		t.Fatalf("NewQueue() = %v", err)
+	}
+	for _, proxyID := range []string{"proxy-a", "proxy-b"} {
+		queue.Record(domain.Event{ProxyID: proxyID, Stage: domain.StageDial, Success: true, ObservedAt: time.Now()})
+	}
+	client := &outcomeClientStub{}
+	reporter, err := NewOutcomeReporter(client, queue, OutcomeReporterOptions{WorkerID: "worker-a", MaxBatchesPerReportRPC: 2})
+	if err != nil {
+		t.Fatalf("NewOutcomeReporter() = %v", err)
+	}
+	reporter.sessionID = "session-a"
+	if err := reporter.Report(context.Background(), "session-a"); err != nil {
+		t.Fatalf("Report() = %v", err)
+	}
+	if len(client.batches) != 2 || client.batches[0].GetSequence() != 1 || client.batches[1].GetSequence() != 2 {
+		t.Fatalf("sent batches = %+v", client.batches)
+	}
+}
+
+func TestOutcomeReporterRetriesTransientFailureWithinRegisteredSession(t *testing.T) {
+	queue, err := gatewayOutcome.NewQueue(gatewayOutcome.QueueOptions{Capacity: 4, MaxBatch: 2})
+	if err != nil {
+		t.Fatalf("NewQueue() = %v", err)
+	}
+	queue.Record(domain.Event{ProxyID: "proxy-a", Stage: domain.StageDial, Success: true, ObservedAt: time.Now()})
+	client := &retryingOutcomeClient{failures: 1, confirmed: make(chan struct{}, 1)}
+	reporter, err := NewOutcomeReporter(client, queue, OutcomeReporterOptions{WorkerID: "worker-a"})
+	if err != nil {
+		t.Fatalf("NewOutcomeReporter() = %v", err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	defer cancel()
+	done := make(chan error, 1)
+	go func() { done <- reporter.RunRegistered(ctx, Registration{SessionID: "session-a"}) }()
+
+	select {
+	case <-client.confirmed:
+	case <-time.After(time.Second):
+		t.Fatal("outcome batch was not confirmed after transient failure")
+	}
+	if batches := client.Batches(); len(batches) != 2 || batches[0].GetSequence() != 1 ||
+		batches[1].GetSequence() != 1 || batches[0].GetOutcomes()[0].GetProxyId() != "proxy-a" {
+		t.Fatalf("sent batches = %+v, want exact retry in the same session", batches)
+	}
+	cancel()
+	if err := <-done; !errors.Is(err, context.Canceled) {
+		t.Fatalf("RunRegistered() = %v, want context canceled", err)
+	}
+}
+
+func TestOutcomeReporterRejectsUnboundedStreamOptions(t *testing.T) {
+	queue, err := gatewayOutcome.NewQueue(gatewayOutcome.QueueOptions{Capacity: 1, MaxBatch: 1})
+	if err != nil {
+		t.Fatalf("NewQueue() = %v", err)
+	}
+	if _, err := NewOutcomeReporter(&outcomeClientStub{}, queue, OutcomeReporterOptions{
+		WorkerID: "worker-a", MaxBatchesPerReportRPC: domain.MaxBatchesPerStream + 1,
+	}); !errors.Is(err, ErrInvalidOutcomeReporter) {
+		t.Fatalf("NewOutcomeReporter() error = %v, want ErrInvalidOutcomeReporter", err)
+	}
+}
+
+type outcomeClientStub struct {
+	batches  []*controlplanev1.OutcomeBatch
+	closeErr error
+	accepted uint64
+}
+
+func (client *outcomeClientStub) ReportOutcomes(context.Context) (OutcomeStream, error) {
+	return &outcomeStreamStub{client: client}, nil
+}
+
+type outcomeStreamStub struct{ client *outcomeClientStub }
+
+func (stream *outcomeStreamStub) Send(batch *controlplanev1.OutcomeBatch) error {
+	stream.client.batches = append(stream.client.batches, batch)
+	return nil
+}
+
+func (stream *outcomeStreamStub) CloseAndRecv() (*controlplanev1.ReportOutcomesResponse, error) {
+	if stream.client.closeErr != nil {
+		return nil, stream.client.closeErr
+	}
+	accepted := stream.client.accepted
+	if accepted == 0 && len(stream.client.batches) > 0 {
+		accepted = stream.client.batches[len(stream.client.batches)-1].GetSequence()
+	}
+	return &controlplanev1.ReportOutcomesResponse{AcceptedThroughSequence: accepted}, nil
+}
+
+type retryingOutcomeClient struct {
+	mu        sync.Mutex
+	batches   []*controlplanev1.OutcomeBatch
+	failures  int
+	confirmed chan struct{}
+}
+
+func (client *retryingOutcomeClient) ReportOutcomes(context.Context) (OutcomeStream, error) {
+	return &retryingOutcomeStream{client: client}, nil
+}
+
+func (client *retryingOutcomeClient) Batches() []*controlplanev1.OutcomeBatch {
+	client.mu.Lock()
+	defer client.mu.Unlock()
+	return append([]*controlplanev1.OutcomeBatch(nil), client.batches...)
+}
+
+type retryingOutcomeStream struct{ client *retryingOutcomeClient }
+
+func (stream *retryingOutcomeStream) Send(batch *controlplanev1.OutcomeBatch) error {
+	stream.client.mu.Lock()
+	stream.client.batches = append(stream.client.batches, batch)
+	stream.client.mu.Unlock()
+	return nil
+}
+
+func (stream *retryingOutcomeStream) CloseAndRecv() (*controlplanev1.ReportOutcomesResponse, error) {
+	stream.client.mu.Lock()
+	if stream.client.failures > 0 {
+		stream.client.failures--
+		stream.client.mu.Unlock()
+		return nil, errors.New("temporary delivery failure")
+	}
+	accepted := stream.client.batches[len(stream.client.batches)-1].GetSequence()
+	confirmed := stream.client.confirmed
+	stream.client.mu.Unlock()
+	select {
+	case confirmed <- struct{}{}:
+	default:
+	}
+	return &controlplanev1.ReportOutcomesResponse{AcceptedThroughSequence: accepted}, nil
+}

internal/gateway/controlplane/session_runner.go

@@ -10,13 +10,18 @@ var ErrSnapshotStreamClosed = errors.New("worker snapshot stream closed")
 type SessionRunner struct {
 	reporter *RuntimeReporter
 	watcher  *SnapshotWatcher
+	outcomes *OutcomeReporter
 }
 
-func NewSessionRunner(reporter *RuntimeReporter, watcher *SnapshotWatcher) (*SessionRunner, error) {
+func NewSessionRunner(reporter *RuntimeReporter, watcher *SnapshotWatcher, outcomes ...*OutcomeReporter) (*SessionRunner, error) {
-	if reporter == nil || watcher == nil {
+	if reporter == nil || watcher == nil || len(outcomes) > 1 || (len(outcomes) == 1 && outcomes[0] == nil) {
 		return nil, ErrInvalidOptions
 	}
-	return &SessionRunner{reporter: reporter, watcher: watcher}, nil
+	runner := &SessionRunner{reporter: reporter, watcher: watcher}
+	if len(outcomes) == 1 {
+		runner.outcomes = outcomes[0]
+	}
+	return runner, nil
 }
 
 // Run registers exactly once, then runs snapshot intake and Runtime reporting
@@ -32,21 +37,36 @@ func (runner *SessionRunner) Run(ctx context.Context) error {
 	}
 	groupCtx, cancel := context.WithCancel(ctx)
 	defer cancel()
-	results := make(chan error, 2)
+	runners := []func() error{
-	go func() { results <- runner.watcher.Watch(groupCtx, registration.SessionID) }()
+		func() error { return runner.watcher.Watch(groupCtx, registration.SessionID) },
-	go func() { results <- runner.reporter.RunRegistered(groupCtx) }()
+		func() error { return runner.reporter.RunRegistered(groupCtx) },
+	}
+	if runner.outcomes != nil {
+		runners = append(runners, func() error { return runner.outcomes.RunRegistered(groupCtx, registration) })
+	}
+	results := make(chan error, len(runners))
+	for _, run := range runners {
+		go func(run func() error) { results <- run() }(run)
+	}
 
 	first := <-results
 	cancel()
-	second := <-results
+	others := make([]error, 0, len(runners)-1)
+	for range len(runners) - 1 {
+		others = append(others, <-results)
+	}
 	if ctx.Err() != nil {
 		return ctx.Err()
 	}
 	if first == nil {
 		return ErrSnapshotStreamClosed
 	}
-	if errors.Is(first, context.Canceled) && second != nil {
+	if errors.Is(first, context.Canceled) {
-		return second
+		for _, other := range others {
+			if other != nil && !errors.Is(other, context.Canceled) {
+				return other
+			}
+		}
 	}
 	return first
 }

internal/gateway/outcome/queue.go

@@ -0,0 +1,99 @@
+// Package outcome provides the Gateway's bounded, non-blocking observation
+// buffer. It deliberately has no dependency on Controller or storage code.
+package outcome
+
+import (
+	"context"
+	"errors"
+	"sync/atomic"
+
+	domain "proxy-pool/internal/domain/outcome"
+)
+
+var ErrInvalidQueueOptions = errors.New("invalid gateway outcome queue options")
+
+type QueueOptions struct {
+	Capacity int
+	MaxBatch int
+}
+
+// Queue accepts observations from the request path without blocking. Events
+// beyond Capacity are intentionally dropped because outcome telemetry must not
+// delay proxy forwarding or consume unbounded process memory.
+type Queue struct {
+	events   chan domain.Event
+	maxBatch int
+	dropped  atomic.Uint64
+}
+
+func NewQueue(options QueueOptions) (*Queue, error) {
+	if options.Capacity <= 0 || options.MaxBatch <= 0 || options.MaxBatch > options.Capacity {
+		return nil, ErrInvalidQueueOptions
+	}
+	return &Queue{events: make(chan domain.Event, options.Capacity), maxBatch: options.MaxBatch}, nil
+}
+
+func (queue *Queue) Record(event domain.Event) {
+	if queue == nil {
+		return
+	}
+	select {
+	case queue.events <- event:
+	default:
+		queue.dropped.Add(1)
+	}
+}
+
+func (queue *Queue) Dropped() uint64 {
+	if queue == nil {
+		return 0
+	}
+	return queue.dropped.Load()
+}
+
+func (queue *Queue) MaxBatch() int {
+	if queue == nil {
+		return 0
+	}
+	return queue.maxBatch
+}
+
+// Next waits for one event then drains an immediately available bounded batch.
+func (queue *Queue) Next(ctx context.Context) ([]domain.Event, error) {
+	if queue == nil || ctx == nil {
+		return nil, ErrInvalidQueueOptions
+	}
+	select {
+	case <-ctx.Done():
+		return nil, ctx.Err()
+	case first := <-queue.events:
+		return queue.drain(first), nil
+	}
+}
+
+// TryNext drains one batch only when work is already buffered.
+func (queue *Queue) TryNext() ([]domain.Event, bool) {
+	if queue == nil {
+		return nil, false
+	}
+	select {
+	case first := <-queue.events:
+		return queue.drain(first), true
+	default:
+		return nil, false
+	}
+}
+
+func (queue *Queue) drain(first domain.Event) []domain.Event {
+	batch := make([]domain.Event, 0, queue.maxBatch)
+	batch = append(batch, first)
+	for len(batch) < queue.maxBatch {
+		select {
+		case event := <-queue.events:
+			batch = append(batch, event)
+		default:
+			return batch
+		}
+	}
+	return batch
+}

internal/gateway/outcome/queue_test.go

@@ -0,0 +1,41 @@
+package outcome
+
+import (
+	"context"
+	"errors"
+	"testing"
+
+	domain "proxy-pool/internal/domain/outcome"
+)
+
+func TestQueueBatchesWithoutBlockingAndCountsOverflow(t *testing.T) {
+	queue, err := NewQueue(QueueOptions{Capacity: 2, MaxBatch: 2})
+	if err != nil {
+		t.Fatalf("NewQueue() = %v", err)
+	}
+	queue.Record(domain.Event{ProxyID: "proxy-a"})
+	queue.Record(domain.Event{ProxyID: "proxy-b"})
+	queue.Record(domain.Event{ProxyID: "proxy-c"})
+	if queue.Dropped() != 1 {
+		t.Fatalf("Dropped() = %d, want 1", queue.Dropped())
+	}
+	batch, err := queue.Next(context.Background())
+	if err != nil || len(batch) != 2 || batch[0].ProxyID != "proxy-a" || batch[1].ProxyID != "proxy-b" {
+		t.Fatalf("Next() = %+v, %v", batch, err)
+	}
+	if batch, ok := queue.TryNext(); ok || batch != nil {
+		t.Fatalf("TryNext() = %+v, %t; want nil, false", batch, ok)
+	}
+}
+
+func TestQueueHonorsCanceledContext(t *testing.T) {
+	queue, err := NewQueue(QueueOptions{Capacity: 1, MaxBatch: 1})
+	if err != nil {
+		t.Fatalf("NewQueue() = %v", err)
+	}
+	ctx, cancel := context.WithCancel(context.Background())
+	cancel()
+	if _, err := queue.Next(ctx); !errors.Is(err, context.Canceled) {
+		t.Fatalf("Next(canceled) = %v, want context canceled", err)
+	}
+}

internal/gateway/server/handler.go

@@ -14,6 +14,7 @@ import (
 	"sync/atomic"
 	"time"
 
+	outcomeDomain "proxy-pool/internal/domain/outcome"
 	proxyDomain "proxy-pool/internal/domain/proxy"
 	"proxy-pool/internal/domain/routing"
 	"proxy-pool/internal/gateway/dispatch"
@@ -78,6 +79,12 @@ type DirectTransport interface {
 	OpenDirectTunnel(context.Context, string) (net.Conn, error)
 }
 
+// OutcomeRecorder accepts best-effort proxy observations. Implementations must
+// return immediately; request forwarding never waits for telemetry delivery.
+type OutcomeRecorder interface {
+	Record(outcomeDomain.Event)
+}
+
 type waitingDispatcher interface {
 	AcquireWait(context.Context, dispatch.Request, time.Duration) (*dispatch.Lease, error)
 }
@@ -90,6 +97,7 @@ type Dependencies struct {
 	Router     Router
 	Dispatcher Dispatcher
 	Transport  ProxyTransport
+	Outcomes   OutcomeRecorder
 }
 
 type Handler struct {
@@ -99,6 +107,7 @@ type Handler struct {
 	router        Router
 	dispatcher    Dispatcher
 	transport     ProxyTransport
+	outcomes      OutcomeRecorder
 	buffers       sync.Pool
 	inFlight      chan struct{}
 	forceClose    atomic.Bool
@@ -136,6 +145,7 @@ func New(config Config, dependencies Dependencies) (*Handler, error) {
 		router:       dependencies.Router,
 		dispatcher:   dependencies.Dispatcher,
 		transport:    dependencies.Transport,
+		outcomes:     dependencies.Outcomes,
 		tunnels:      make(map[*activeTunnel]struct{}),
 		shutdownDone: make(chan struct{}),
 	}
@@ -230,14 +240,16 @@ func (handler *Handler) connect(
 					lastErr = directErr
 					break
 				}
-				handler.serveTunnel(writer, request, nil, upstream)
+				handler.serveTunnel(writer, request, nil, upstream, "", "")
 				return
 			}
 			break
 		}
 
+		started := time.Now().UTC()
 		upstream, err := handler.transport.OpenTunnel(request.Context(), lease.Proxy, target.DialAddress())
 		if err != nil {
+			handler.recordOutcome(lease.Proxy.ID, route.RoutingName, outcomeDomain.StageProxyHandshake, false, err, started)
 			finishLease(lease, false)
 			excluded[lease.Proxy.ID] = struct{}{}
 			var responseError *transportDomain.ProxyResponseError
@@ -259,7 +271,8 @@ func (handler *Handler) connect(
 			lastErr = err
 			break
 		}
-		handler.serveTunnel(writer, request, func() { finishLease(lease, true) }, upstream)
+		handler.recordOutcome(lease.Proxy.ID, route.RoutingName, outcomeDomain.StageProxyHandshake, true, nil, started)
+		handler.serveTunnel(writer, request, func() { finishLease(lease, true) }, upstream, lease.Proxy.ID, route.RoutingName)
 		return
 	}
 
@@ -279,6 +292,8 @@ func (handler *Handler) serveTunnel(
 	request *http.Request,
 	finish func(),
 	upstream net.Conn,
+	proxyID string,
+	routingName string,
 ) {
 	if finish != nil {
 		defer finish()
@@ -287,11 +302,13 @@ func (handler *Handler) serveTunnel(
 
 	hijacker, ok := writer.(http.Hijacker)
 	if !ok {
+		handler.recordOutcome(proxyID, routingName, outcomeDomain.StageTunnel, false, errors.New("gateway response does not support connection hijacking"), time.Now().UTC())
 		http.Error(writer, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
 		return
 	}
 	client, readWriter, err := hijacker.Hijack()
 	if err != nil {
+		handler.recordOutcome(proxyID, routingName, outcomeDomain.StageTunnel, false, err, time.Now().UTC())
 		http.Error(writer, http.StatusText(http.StatusInternalServerError), http.StatusInternalServerError)
 		return
 	}
@@ -302,14 +319,18 @@ func (handler *Handler) serveTunnel(
 	}
 	defer handler.unregisterTunnel(tunnel)
 
+	started := time.Now().UTC()
 	if _, err := readWriter.WriteString("HTTP/1.1 200 Connection Established\r\n\r\n"); err != nil {
+		handler.recordOutcome(proxyID, routingName, outcomeDomain.StageTunnel, false, err, started)
 		return
 	}
 	if err := readWriter.Flush(); err != nil {
+		handler.recordOutcome(proxyID, routingName, outcomeDomain.StageTunnel, false, err, started)
 		return
 	}
 	bufferedClient := &bufferedClientConn{Conn: client, reader: readWriter.Reader}
-	_ = handler.transport.Relay(request.Context(), bufferedClient, upstream)
+	err = handler.transport.Relay(request.Context(), bufferedClient, upstream)
+	handler.recordOutcome(proxyID, routingName, outcomeDomain.StageTunnel, err == nil, err, started)
 }
 
 func (handler *Handler) Shutdown(ctx context.Context) error {
@@ -444,8 +465,10 @@ func (handler *Handler) forwardHTTP(
 			committed.Store(true)
 			return nil
 		}
+		started := time.Now().UTC()
 		response, err := handler.transport.RoundTrip(request.Context(), lease.Proxy, attemptRequest, commit)
 		if err != nil {
+			handler.recordOutcome(lease.Proxy.ID, route.RoutingName, outcomeDomain.StageDial, false, err, started)
 			finishLease(lease, committed.Load())
 			excluded[lease.Proxy.ID] = struct{}{}
 			lastErr = err
@@ -455,10 +478,17 @@ func (handler *Handler) forwardHTTP(
 			if err := commit(); err != nil {
 				_ = response.Body.Close()
 				finishLease(lease, false)
+				handler.recordOutcome(lease.Proxy.ID, route.RoutingName, outcomeDomain.StageResponseHeaders, false, err, started)
 				lastErr = err
 				break
 			}
 		}
+		if response.StatusCode == http.StatusProxyAuthRequired {
+			handler.recordOutcome(lease.Proxy.ID, route.RoutingName, outcomeDomain.StageResponseHeaders, false,
+				&transportDomain.ProxyResponseError{StatusCode: response.StatusCode}, started)
+		} else {
+			handler.recordOutcome(lease.Proxy.ID, route.RoutingName, outcomeDomain.StageResponseHeaders, true, nil, started)
+		}
 		handler.writeResponse(writer, response)
 		finishLease(lease, true)
 		return
@@ -467,6 +497,61 @@ func (handler *Handler) forwardHTTP(
 	writeGatewayError(writer, fmt.Errorf("forward gateway request: %w", lastErr))
 }
 
+func (handler *Handler) recordOutcome(
+	proxyID, routingName string,
+	stage outcomeDomain.Stage,
+	success bool,
+	err error,
+	started time.Time,
+) {
+	if handler == nil || handler.outcomes == nil || proxyID == "" {
+		return
+	}
+	observedAt := time.Now().UTC()
+	if started.IsZero() {
+		started = observedAt
+	}
+	latency := observedAt.Sub(started)
+	if latency < 0 {
+		latency = 0
+	}
+	event := outcomeDomain.Event{
+		ProxyID: proxyID, RoutingName: routingName, Stage: stage, Success: success,
+		Latency: latency, ObservedAt: observedAt,
+	}
+	if !success {
+		event.ErrorClass = classifyOutcomeError(stage, err)
+	}
+	handler.outcomes.Record(event)
+}
+
+func classifyOutcomeError(stage outcomeDomain.Stage, err error) outcomeDomain.ErrorClass {
+	switch {
+	case errors.Is(err, context.Canceled):
+		return outcomeDomain.ErrorClassCanceled
+	case errors.Is(err, context.DeadlineExceeded):
+		return outcomeDomain.ErrorClassTimeout
+	}
+	var responseError *transportDomain.ProxyResponseError
+	if errors.As(err, &responseError) {
+		return outcomeDomain.ErrorClassProxyResponse
+	}
+	var networkError net.Error
+	if errors.As(err, &networkError) && networkError.Timeout() {
+		return outcomeDomain.ErrorClassTimeout
+	}
+	switch stage {
+	case outcomeDomain.StageDial:
+		return outcomeDomain.ErrorClassDial
+	case outcomeDomain.StageProxyHandshake:
+		return outcomeDomain.ErrorClassHandshake
+	case outcomeDomain.StageTunnel:
+		return outcomeDomain.ErrorClassRelay
+	default:
+		return outcomeDomain.ErrorClassInternal
+	}
+}
+
 func (handler *Handler) acquireRoute(ctx context.Context, route dispatch.Request) (*dispatch.Lease, error) {
 	lease, err := handler.dispatcher.Acquire(route)
 	if !errors.Is(err, dispatch.ErrNoCandidate) || route.OnUnavailable != routing.OnUnavailableWait || route.WaitTimeout <= 0 {

internal/gateway/server/handler_test.go

@@ -15,6 +15,7 @@ import (
 	"testing"
 	"time"
 
+	outcomeDomain "proxy-pool/internal/domain/outcome"
 	proxyDomain "proxy-pool/internal/domain/proxy"
 	"proxy-pool/internal/domain/routing"
 	"proxy-pool/internal/gateway/dispatch"
@@ -103,6 +104,50 @@ func TestHandlerRetriesGETWithAnotherProxyBeforeResponseCommit(t *testing.T) {
 	assertNoLeakedCapacity(t, view)
 }
 
+func TestHandlerRecordsOutcomeForEachProxyAttempt(t *testing.T) {
+	dispatcher, _ := dispatcherWithProxies(t, "proxy-a", "proxy-b")
+	transport := &fakeTransport{roundTrip: func(
+		_ context.Context,
+		selected proxyDomain.Proxy,
+		_ *http.Request,
+		commit ...func() error,
+	) (*http.Response, error) {
+		if selected.ID == "proxy-a" {
+			return nil, errors.New("dial failed")
+		}
+		if err := commit[0](); err != nil {
+			return nil, err
+		}
+		return &http.Response{StatusCode: http.StatusNoContent, Header: make(http.Header), Body: http.NoBody}, nil
+	}}
+	handler := newTestHandler(t, Config{MaxAttempts: 2, RetryMethods: []string{http.MethodGet}}, dispatcher, transport)
+	recorder := &outcomeRecorder{}
+	handler.outcomes = recorder
+
+	response := httptest.NewRecorder()
+	handler.ServeHTTP(response, httptest.NewRequest(http.MethodGet, "http://example.test/resource", nil))
+	events := recorder.Events()
+	if response.Code != http.StatusNoContent || len(events) != 2 {
+		t.Fatalf("status=%d events=%+v", response.Code, events)
+	}
+	if events[0].ProxyID != "proxy-a" || events[0].Stage != outcomeDomain.StageDial || events[0].Success ||
+		events[0].ErrorClass != outcomeDomain.ErrorClassDial || events[1].ProxyID != "proxy-b" ||
+		events[1].Stage != outcomeDomain.StageResponseHeaders || !events[1].Success {
+		t.Fatalf("outcomes = %+v", events)
+	}
+}
+
+func TestHandlerClampsNegativeOutcomeLatency(t *testing.T) {
+	recorder := &outcomeRecorder{}
+	handler := &Handler{outcomes: recorder}
+	handler.recordOutcome("proxy-a", "route-a", outcomeDomain.StageDial, true, nil, time.Now().Add(time.Second))
+
+	events := recorder.Events()
+	if len(events) != 1 || events[0].Latency != 0 {
+		t.Fatalf("outcomes = %+v, want zero latency", events)
+	}
+}
+
 func TestHandlerDoesNotRetryPOST(t *testing.T) {
 	t.Parallel()
 
@@ -149,6 +194,8 @@ func TestHandlerReturns407WithoutRetry(t *testing.T) {
 		}, nil
 	}}
 	handler := newTestHandler(t, Config{MaxAttempts: 2, RetryMethods: []string{http.MethodGet}}, dispatcher, transport)
+	recorder := &outcomeRecorder{}
+	handler.outcomes = recorder
 
 	response := httptest.NewRecorder()
 	handler.ServeHTTP(response, httptest.NewRequest(http.MethodGet, "http://example.test/resource", nil))
@@ -159,6 +206,11 @@ func TestHandlerReturns407WithoutRetry(t *testing.T) {
 	if len(transport.attempts()) != 1 {
 		t.Fatalf("attempts = %v, want no retry for 407", transport.attempts())
 	}
+	events := recorder.Events()
+	if len(events) != 1 || events[0].Success || events[0].Stage != outcomeDomain.StageResponseHeaders ||
+		events[0].ErrorClass != outcomeDomain.ErrorClassProxyResponse {
+		t.Fatalf("outcomes = %+v, want failed proxy response", events)
+	}
 	assertNoLeakedCapacity(t, view)
 }
 
@@ -496,6 +548,23 @@ type fakeTransport struct {
 	relay           func(context.Context, net.Conn, net.Conn) error
 }
 
+type outcomeRecorder struct {
+	mu     sync.Mutex
+	events []outcomeDomain.Event
+}
+
+func (recorder *outcomeRecorder) Record(event outcomeDomain.Event) {
+	recorder.mu.Lock()
+	recorder.events = append(recorder.events, event)
+	recorder.mu.Unlock()
+}
+
+func (recorder *outcomeRecorder) Events() []outcomeDomain.Event {
+	recorder.mu.Lock()
+	defer recorder.mu.Unlock()
+	return append([]outcomeDomain.Event(nil), recorder.events...)
+}
+
 type waitRecordingDispatcher struct{ waitTimeout time.Duration }
 
 func (dispatcher *waitRecordingDispatcher) Acquire(dispatch.Request) (*dispatch.Lease, error) {