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/metrics carried only the inbound HTTP surface, so a destination failing for an hour, a growing retry backlog and a stuck-open circuit breaker were all invisible: the receive side stays healthy in each case because it is. New internal/metrics registers, on the existing default registry that the go-http-metrics recorder and the promhttp handler already share: - webhooker_events_received_total - webhooker_delivery_attempts_total - webhooker_deliveries_succeeded_total - webhooker_deliveries_failed_total - webhooker_delivery_retries_total - webhooker_delivery_duration_seconds - webhooker_deliveries_pending / _retrying - webhooker_circuit_breakers_open The route mounting is untouched. Every delivery metric carries one label, target_type, whose domain is the four target-type constants; anything outside it collapses to "unknown" so no series can be minted from a UUID. Target ids, event ids and entrypoint ids are deliberately not labels. Instrumentation sits at the points every target type already passes through: processDelivery for the attempt counter and the duration histogram, updateDeliveryStatus for the outcome counters. The queue-depth gauges are counted out of the per-webhook databases by a 30s sampler rather than tracked as deltas, which would need seeding at startup and would drift on any transition that failed to persist. The open-breaker gauge is recounted from the target's breaker registry on every state change.
2.5 KiB
2.5 KiB