feat(observability): Prometheus /metrics endpoint with tracing bridge (STR-2557)#1516
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feat(observability): Prometheus /metrics endpoint with tracing bridge (STR-2557)#1516
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…2557) Use the `metrics` crate (same facade Reth uses) with `metrics-exporter-prometheus` for the HTTP endpoint. For alpen-client: domain gauges automatically appear on Reth's built-in --metrics endpoint alongside EVM/P2P metrics. For strata binary: metrics-exporter-prometheus serves /metrics on configurable logging.metrics_port. Chain progress gauges: - alpen_l1_tip_height: ASM worker anchor block height - alpen_l2_sync_tip_slot: L2 sync worker tip slot - alpen_l2_finalized_slot: last finalized L2 slot - alpen_ol_tip_slot: OL fork-choice best block slot Tracing-to-metrics bridge: - MetricsLayer captures span busy/idle timing as histograms (alpen_span_busy_seconds / alpen_span_idle_seconds) so they flow to Prometheus instead of only being visible in Loki logs DB metrics: - alpen_db_transaction_duration_seconds histogram for sled transactions, independent of log level
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Commit: 4513b72 SP1 Execution Results
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Codecov Report❌ Patch coverage is
@@ Coverage Diff @@
## main #1516 +/- ##
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- Coverage 75.24% 65.55% -9.69%
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Files 800 801 +1
Lines 74882 75671 +789
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- Hits 56342 49608 -6734
- Misses 18540 26063 +7523
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Adds Prometheus metrics support using the
metricscrate (same facade Reth uses).alpen_l1_tip_height,alpen_l2_sync_tip_slot,alpen_l2_finalized_slot,alpen_ol_tip_slotMetricsLayercaptures span busy/idle timing asalpen_span_busy_seconds/alpen_span_idle_secondshistograms — flows to Prometheus instead of only Lokialpen_db_transaction_duration_secondsfor sled transactions (independent of log level)stratabinary:metrics-exporter-prometheusserves/metricson configurablelogging.metrics_portalpen-client: our gauges automatically appear on Reth's built-in--metricsendpointAll calls are no-ops when no recorder is installed.
STR-2557