Hugo Nijhuis 71c6011f49 Add EventBroadcaster metrics for observability and debugging ...

Implement comprehensive metrics tracking for EventBroadcaster implementations:

- Add BroadcasterMetrics interface for reading metrics per namespace
- Add MetricsCollector interface and DefaultMetricsCollector implementation
- Track events_published and events_received counters per namespace
- Track active_subscriptions gauge per namespace
- Track publish_errors, subscribe_errors, and dropped_events counters
- Add MetricsProvider interface for EventBroadcaster implementations
- Integrate metrics tracking into EventBus and NATSEventBus
- Add optional Prometheus integration via PrometheusMetricsAdapter

Closes #22

Co-Authored-By: Claude Opus 4.5 <noreply@anthropic.com>

2026-01-10 19:23:00 +01:00

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