jgrusewski a958582eaa feat(common): add gRPC metrics Tower layer for automatic instrumentation ...

Add a reusable GrpcMetricsLayer that can be applied to any tonic server
via Server::builder().layer() to automatically emit three Prometheus
metric families for every gRPC handler: started_total, handled_total
(with status code), and handling_seconds histogram.

Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>

2026-03-01 02:23:36 +01:00

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