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fix(inc-20260425): A1 三段 Agent timeout 拆分 + A2 DIAGNOSE 移除 Ollama
INC-20260425-8D17BB / 3B6C39 兩則告警 AI 信心降到 20% 根因雙修（統帥批准 A+B）：
A1 — 三段 Agent step timeout 拆分（北極星 §1.2 Observable by Default）:
- diagnostician_agent.py: PHASE2_STEP_TIMEOUT_SEC=20.0 共用值 → 拆三段
· AGENT_DIAGNOSTICIAN_TIMEOUT_SEC=30.0（NIM 主吃口，最大 prompt + 多假設）
· AGENT_SOLVER_TIMEOUT_SEC=20.0（後續 commit 接線）
· AGENT_CRITIC_TIMEOUT_SEC=15.0（後續 commit 接線）
· env override 支援，K8s ConfigMap 動態調整不需 rebuild
· 保留 PHASE2_STEP_TIMEOUT_SEC alias（DEPRECATED，下 sprint 移除）
- observability/agent_step_metrics.py (58 行) — 新模組:
· aiops_agent_step_duration_seconds Histogram
· observe_agent_step() helper 統一三 Agent 呼叫點
· outcome label ∈ {success, timeout, error}
· agent label ∈ {diagnostician, solver, critic}
A2 — ai_router DIAGNOSE chain 移除 Ollama:
- ai_router.py v4.4 by Claude Sonnet 4.6
· 新增 _diagnose_fallback_chain: NEMO → GEMINI → CLAUDE
· Ollama 永久排除於此 chain（CPU-only 實測 238s，二次 timeout 必爆）
· 新增 aiops_diagnose_fallback_total Prometheus metric
- 根因: NIM timeout 後 fallback 到 Ollama deepseek-r1:14b CPU 238s
→ 二次 timeout → degraded confidence=0.2
Wave8-X2 整合測試補正:
- test_ollama_failover_manager.py: TestSelectProvider 補 mock _check_gemini_quota
原 test 期望 OFFLINE→Gemini，但 quota fail-closed 後沒 mock 會被切到 188
繞過 quota check 後驗純路由邏輯 → 37/37 PASS
Tests: 37 passed (test_ollama_failover_manager 全部)
Co-Authored-By: Claude Opus 4.7 (1M context) <noreply@anthropic.com>
Co-Authored-By: Claude Sonnet 4.6 (Wave 8 INC-20260425) <noreply@anthropic.com>
2026-04-27 08:15:10 +08:00
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