WFGY/ProblemMap/ops/live_monitoring_rag.md
2025-08-15 23:36:37 +08:00

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Live monitoring & alerting — RAG services

Goal: list of recommended metrics, alert rules and dashboard panels to keep RAG pipelines observable and actionable.


Service-level

  • rag_e2e_latency_seconds (histogram) — E2E latency (request in → answer out)
  • rag_error_count_total — errors per endpoint
  • rag_request_count_total — total requests

Retrieval-level

  • retriever_qps_total
  • retriever_retrieved_docs_count (per request)
  • retriever_empty_result_count_total — unexpected empty sets

Vectorstore

  • vectorstore_index_load_time_seconds
  • vectorstore_memory_bytes
  • vectorstore_indexed_docs_total

Accuracy/provenance

  • rag_citation_hit_rate (CHR gauge over sliding window)
  • rag_precision_shipped (periodic batch scorer push)
  • rag_under_refusal_count_total

Infrastructure

  • llm_api_rate_limited_total
  • llm_api_error_total
  • queue_backlog_count (if using background queues)

Suggested PromQL alerts (examples)

Tune thresholds to your workload.

A) Latency breach (interactive)

alert: RAGHighP95Latency
expr: histogram_quantile(0.95, sum(rate(rag_e2e_latency_seconds_bucket[5m])) by (le,instance)) > 2
for: 5m
labels:
  severity: page
annotations:
  summary: "RAG p95 > 2s ({{ $labels.instance }})"

B) Error spike

alert: RAGErrorSpike
expr: increase(rag_error_count_total[5m]) > 50
for: 2m
labels: { severity: page }

C) Retriever empty results

alert: RetrieverEmptyResults
expr: increase(retriever_empty_result_count_total[5m]) > 1
for: 5m
labels: { severity: ticket }

D) CHR drop

alert: CHRDrop
expr: rag_citation_hit_rate < 0.6
for: 10m
labels: { severity: ticket }

E) LLM auth failure

alert: LLMAuthFail
expr: increase(llm_api_error_total{code="401"}[5m]) > 0
for: 1m

  1. E2E latency (p50/p95/p99) trend.
  2. Requests per second and error rate.
  3. Retriever QPS, avg retrieved docs, empty results.
  4. CHR & Precision (batch scorer push).
  5. Vectorstore memory & disk IO.
  6. LLM provider error & rate-limit metrics.

Incident play (fast actions)

  1. If CHR drop → run diagnostic retrieval for 10 golden queries (retrieved ids + cosine scores).
  2. If retriever empty → check vectorstore health and index partitions. Restart index shard if needed.
  3. If E2E latency spike with LLM errors → throttle traffic, put a hard rate limit and rollback deploy if needed.
  4. If LLM auth failure → rotate key & redeploy secrets.

How to integrate scoring metrics

  • Periodic scorer job should push rag_citation_hit_rate and rag_precision_shipped as a short-timeseries gauge (per 515m window).
  • Use batching: run score_eval.py (see ProblemMap/eval/README.md) nightly and push summary metrics via a small exporter.

Troubleshooting queries (prometheus examples)

  • Check p95 per instance:

    histogram_quantile(0.95, sum(rate(rag_e2e_latency_seconds_bucket[5m])) by (le,instance))
    
  • CHR trend:

    avg_over_time(rag_citation_hit_rate[30m])
    


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