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- Implement tracing subscriber layer that captures log events as Prometheus metrics
- Expose phaser_log_events_total{level, service, module} counter
- Track ERROR, WARN, INFO by default (skip DEBUG/TRACE for cardinality control)
- Use global OnceCell for single metric registration
- Add dependencies: tracing, tracing-subscriber, once_cell
Cardinality: ~210-350 time series (3 levels × 2 services × 35-50 modules)
- Re-export MetricsLayer from phaser-metrics - Initialize tracing with MetricsLayer using layered subscriber pattern - Service label: "erigon-bridge" - Metrics exposed on existing /metrics endpoint (port 9091)
- Re-export MetricsLayer from phaser-metrics - Initialize tracing with MetricsLayer using layered subscriber pattern - Service label: "phaser-query" - Metrics exposed on existing /metrics endpoint (port 9092)
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The idea with this PR is to inject a layer into
tracingconfig that allows us to export log lines (configurable level) with module to our metrics. This provides another layer of observability where we have not yet put a "real metric" in place yet.