rakka-telemetry

Optional probe surface for observing a running rakka node.

The crate is passive and opt-in. Construct a [TelemetryExtension] and register it on an [rakka_core::actor::ActorSystem] via [rakka_core::actor::Extensions]. Subsystems check for the extension at runtime (cheap Arc<T> lookup) and, when present, emit snapshots + events into the telemetry [bus::TelemetryBus]. When absent, there is no cost beyond a single DashMap lookup.

See [crate::exporters] for the Prometheus / OpenTelemetry exporters gated behind cargo features.