id: pg1-instrumented-metrics
slug: pg1-instrumented-metrics
title: Instrumented Metrics Pipeline
description: Signal write rates, ranking latency p50/p99, personalization staleness, and feedback-loop latency all observable in production
phase: released
created_at: 2026-03-03T06:30:08.990467Z
updated_at: 2026-03-04T06:38:58.975310Z
artifacts:
- artifact_type: spec
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/spec.md
  created_at: 2026-03-04T06:25:03.916582Z
  approved_at: 2026-03-04T06:25:07.872447Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
- artifact_type: design
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/design.md
  created_at: 2026-03-04T06:25:39.569379Z
  approved_at: 2026-03-04T06:25:42.567351Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
- artifact_type: tasks
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/tasks.md
  created_at: 2026-03-04T06:26:01.627817Z
  approved_at: 2026-03-04T06:26:05.095340Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
- artifact_type: qa_plan
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/qa-plan.md
  created_at: 2026-03-04T06:26:22.914537Z
  approved_at: 2026-03-04T06:26:25.925410Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
- artifact_type: review
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/review.md
  created_at: 2026-03-04T06:35:57.313743Z
  approved_at: 2026-03-04T06:36:02.060619Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
- artifact_type: audit
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/audit.md
  created_at: 2026-03-04T06:36:23.188415Z
  approved_at: 2026-03-04T06:36:26.536040Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
- artifact_type: qa_results
  status: approved
  path: .sdlc/features/pg1-instrumented-metrics/qa-results.md
  created_at: 2026-03-04T06:38:48.462062Z
  approved_at: 2026-03-04T06:38:53.032137Z
  rejected_at: null
  rejection_reason: null
  approved_by: null
tasks:
- id: T1
  title: Percentile methods on LatencyHistogram
  description: null
  status: completed
  created_at: 2026-03-04T06:26:33.718281Z
  started_at: null
  completed_at: 2026-03-04T06:27:45.644868Z
  blocker: null
  depends_on: []
- id: T2
  title: Per-signal-type write counters
  description: null
  status: completed
  created_at: 2026-03-04T06:26:34.152429Z
  started_at: null
  completed_at: 2026-03-04T06:34:06.377941Z
  blocker: null
  depends_on: []
- id: T3
  title: UserSignalTimestampMap
  description: null
  status: completed
  created_at: 2026-03-04T06:26:34.601553Z
  started_at: null
  completed_at: 2026-03-04T06:34:06.833138Z
  blocker: null
  depends_on: []
- id: T4
  title: Personalization staleness histogram
  description: null
  status: completed
  created_at: 2026-03-04T06:26:35.043054Z
  started_at: null
  completed_at: 2026-03-04T06:34:07.255986Z
  blocker: null
  depends_on: []
- id: T5
  title: Feedback-loop latency histogram
  description: null
  status: completed
  created_at: 2026-03-04T06:26:35.951120Z
  started_at: null
  completed_at: 2026-03-04T06:34:07.728503Z
  blocker: null
  depends_on: []
- id: T6
  title: /diagnostics JSON endpoint
  description: null
  status: completed
  created_at: 2026-03-04T06:26:36.379601Z
  started_at: null
  completed_at: 2026-03-04T06:34:08.073Z
  blocker: null
  depends_on: []
- id: T7
  title: Integration test
  description: null
  status: completed
  created_at: 2026-03-04T06:26:36.551212Z
  started_at: null
  completed_at: 2026-03-04T06:35:25.344119Z
  blocker: null
  depends_on: []
comments: []
next_comment_seq: 0
blockers: []
phase_history:
- phase: draft
  entered: 2026-03-03T06:30:08.990467Z
  exited: 2026-03-04T06:25:07.873116Z
- phase: specified
  entered: 2026-03-04T06:25:07.873116Z
  exited: 2026-03-04T06:26:25.926430Z
- phase: planned
  entered: 2026-03-04T06:26:25.926430Z
  exited: 2026-03-04T06:26:44.492116Z
- phase: ready
  entered: 2026-03-04T06:26:44.492116Z
  exited: 2026-03-04T06:26:47.866600Z
- phase: implementation
  entered: 2026-03-04T06:26:47.866600Z
  exited: 2026-03-04T06:36:02.061645Z
- phase: review
  entered: 2026-03-04T06:36:02.061645Z
  exited: 2026-03-04T06:36:23.189199Z
- phase: audit
  entered: 2026-03-04T06:36:23.189199Z
  exited: 2026-03-04T06:36:26.536965Z
- phase: qa
  entered: 2026-03-04T06:36:26.536965Z
  exited: 2026-03-04T06:38:53.033071Z
- phase: merge
  entered: 2026-03-04T06:38:53.033071Z
  exited: 2026-03-04T06:38:58.975310Z
- phase: released
  entered: 2026-03-04T06:38:58.975310Z
  exited: null
dependencies: []
archived: false
schema_version: 3