Observability

Go Event Bus provides first-class observability through two mechanisms:

• Tracing via OpenTelemetry - One span per handler invocation, with trace propagation across transport boundaries
• Metrics via a pluggable MetricProvider interface - Latency, success/failure counts, and state gauges from every invoker

Every invoker in the chain emits its own metrics, giving complete visibility into the execution pipeline.

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Table of contents

• Tracing
• Prometheus