Module observability 

Observability — tracing layer stack + (feature-gated) OpenTelemetry OTLP exporter wiring.

Two entry points:

• init — install the global subscriber. Call once at daemon startup before any other tracing event fires. Respects the following env vars:

  Var	Default	Effect
  RUST_LOG	info	EnvFilter directives
  OTEL_LOG_FORMAT	compact	compact / pretty / json
  OTEL_SERVICE_NAME	post-cortex	OTel service.name attr
  OTEL_SERVICE_VERSION	crate version	OTel service.version
  OTEL_EXPORTER_OTLP_ENDPOINT	unset	When set + otel feature on, spans + metrics export to this gRPC endpoint

• shutdown — call before process exit so the OTLP exporter flushes its queue.

When the otel feature is OFF, init still wires the fmt::Subscriber layer + EnvFilter — only the OTLP layer disappears. Library users that disable OTel pay nothing.

Enums

TracingInitError

Errors raised by init.

Functions

init

Initialise the global tracing subscriber.

shutdown

Flush pending spans + metrics, then shut down the OTel SDK.