feat: add metrics, health endpoint, and structured logging (#441)#447
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morelucks wants to merge 1 commit intoleanEthereum:mainfrom
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feat: add metrics, health endpoint, and structured logging (#441)#447morelucks wants to merge 1 commit intoleanEthereum:mainfrom
morelucks wants to merge 1 commit intoleanEthereum:mainfrom
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…eum#441) - Prometheus metrics: slot_current, epoch_current, peers_connected, blocks_imported_total, attestations_processed_total, sync_distance, process_start_time_seconds exposed via /metrics endpoint - Health endpoint: GET /health returns {status, slot, synced} with 200 when synced, 503 otherwise (K8s readiness probe compatible) - Structured JSON logging via --log-format json with slot, epoch, peer_id fields; log level via --log-level / LEANSPEC_LOG_LEVEL - CLI: --metrics-port flag to enable metrics/health server - Docker: EXPOSE 8008, docker-compose with Prometheus + Grafana - Docs: DOCKER_QUICKSTART.md updated with observability section - Grafana dashboard JSON included in observability/
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Implements #441 — adds Prometheus metrics, a health endpoint, and structured JSON logging to
leanspec-node.Changes
Prometheus Metrics (
/metrics)Exposes 7 metrics in Prometheus text exposition format:
leanspec_slot_currentleanspec_epoch_currentslot // JUSTIFICATION_LOOKBACK_SLOTSleanspec_peers_connectedleanspec_blocks_imported_totalSyncService._process_block_wrapperleanspec_attestations_processed_totalleanspec_sync_distanceleanspec_process_start_time_secondsEach Metrics instance uses its own
CollectorRegistryto avoid global state collisions in tests.Health Endpoint (
GET /health)Returns
{"status": "ok", "slot": N, "synced": bool}with:Sync status determined by
SyncService.state.is_synced— suitable for Docker/Kubernetes readiness probes.Structured Logging
--log-format jsonenables JSON output viapython-json-loggerslot,epoch,peers,peer_idas structured fields--log-levelCLI flag (defaults toLEANSPEC_LOG_LEVELenv var)Docker & Deployment
EXPOSE 8008in Dockerfile node stageCLI Flags
--metrics-port PORT--log-format {text,json}--log-level LEVELLEANSPEC_LOG_LEVEL)Acceptance Criteria
/metricsendpoint returns valid Prometheus text exposition format/healthendpoint returns correct synced field based on sync state--log-format jsonis set--metrics-portCLI flagcloses #441