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- internal/logging now wraps log/slog; logging.format json/text finally works (json is the documented default). Same exported API. - New internal/metrics: /metrics on the configured metrics port with notification gauges by status/type, queue depth, and HTTP request count/duration labeled by mux route pattern; sampled from service stats so the service layer stays metrics-agnostic. - Standard grpc.health.v1 health service registered (k8s gRPC probes); gRPC MaxRecvMsgSize bounded to match the REST 1 MB body limit. - Dedicated health listener on health_check.port serving /health and /readyz (probes now work in grpc-only mode); metrics, health, and REST servers all shut down gracefully. - main wires retry backoff, CORS, readiness checks, and TLS from config. Co-Authored-By: Claude Fable 5 <noreply@anthropic.com>