Module telemetry 

Observability layer — OpenTelemetry tracing, structured logging, Prometheus metrics.

All components are feature-gated for zero overhead when disabled:

• tracing-support: Console logging via tracing-subscriber
• metrics: Prometheus metric definitions and export
• otel-otlp: OTLP trace and metric export to any OTel collector
• otel-gcp: Google Cloud-native trace and metric export (Cloud Trace + Cloud Monitoring)

Modules

logging

Structured logging helpers.

metrics

Prometheus metric definitions — counters, histograms, gauges.

spans

OpenTelemetry span definitions for session operations.

Structs

TelemetryConfig

Telemetry configuration.

TelemetryGuard

Guard that keeps telemetry systems alive while held. Drop this to flush and shutdown OTel exporters.