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Bug: Dashboard showed zeros because it detected "go" as the prefix instead
of "muxstr" when Go runtime metrics appeared first in the metrics list.
Fix: Search for the first metric containing "_relay_" to properly detect
the namespace (muxstr, nostr-grpc, etc.) instead of using the first metric
in the alphabetical list.
Before: Object.keys(metrics)[0] → "go_gc_..." → prefix = "go"
After: Find metric with "_relay_" → "muxstr_relay_..." → prefix = "muxstr"
This fixes the dashboard displaying zeros when metrics data is present.
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Two critical fixes for metrics:
1. Fix interceptor chaining
- Changed from mixed grpc.UnaryInterceptor/ChainUnaryInterceptor to
proper chaining with grpc.ChainUnaryInterceptor
- Metrics interceptor now runs first (as intended)
- All interceptors properly chained in order: metrics → auth → ratelimit
- This fixes metrics not being recorded for any requests
2. Fix dashboard uptime calculation
- Changed from page load time to process_start_time_seconds metric
- Uptime now persists correctly across page refreshes
- Uses Prometheus standard process_start_time_seconds gauge
Before: Metrics showed 0 for all requests, uptime reset on refresh
After: Metrics properly record all gRPC requests, uptime shows actual relay uptime
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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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