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AlertingMetrics @Component wraps MeterRegistry:
- Counters: alerting_eval_errors_total{kind}, alerting_circuit_opened_total{kind},
alerting_notifications_total{status}
- Timers: alerting_eval_duration_seconds{kind}, alerting_webhook_delivery_duration_seconds
- Gauges (DB-backed): alerting_rules_total{state}, alerting_instances_total{state}
AlertEvaluatorJob records evalError + evalDuration around each evaluator call.
PerKindCircuitBreaker detects open transitions and fires metrics.circuitOpened(kind).
AlertingBeanConfig wires AlertingMetrics into the circuit breaker post-construction.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>