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Add a real-time metrics dashboard accessible at the metrics server root.
The dashboard displays relay statistics in a human-readable format with
auto-refresh every 5 seconds.
Features:
- Active connections and subscriptions
- Request counts (total, success, errors)
- Authentication stats (success/failure)
- Rate limiting hits
- Storage metrics (events, DB size, deletions)
- Clean, dark-themed UI with gradient accents
- Auto-refresh and live uptime counter
The dashboard is embedded using go:embed and served at / while
Prometheus metrics continue to be available at /metrics.
Example: http://localhost:9090/ for dashboard
http://localhost:9090/metrics for raw metrics
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