feat: Add Grafana dashboard for Prometheus metrics

changelog.d/prometheus-metrics.feature.md

@@ -1 +1 @@
-Added an opt-in Prometheus metrics endpoint at `/_continuwuity/metrics` covering HTTP requests, federation, the sender queue, database and cache memory, and the tokio runtime. Contributed by @eleboucher.
+Added an opt-in Prometheus metrics endpoint at `/_continuwuity/metrics` covering HTTP requests, federation, the sender queue, database and cache memory, and the tokio runtime, along with a Grafana dashboard. Contributed by @eleboucher.

docs/guides/metrics.mdx

@@ -47,3 +47,7 @@ All metrics are prefixed with `continuwuity_`.
 | `tokio_global_queue_depth` | gauge | | Tasks in the tokio global queue |
 | `tokio_worker_busy_seconds_total` | counter | | Time worker threads spent busy |
 | `tokio_worker_parks_total` | counter | | Number of times worker threads parked |
+
+## Grafana dashboard
+
+Import [grafana-dashboard.json](/guides/grafana-dashboard.json) under **Dashboards → New → Import**, or provision it from a file.

rspress.config.ts

@@ -31,6 +31,7 @@ export default defineConfig({
                     '/advanced/delegated.docker-compose.with-traefik.yml',
                     '/calls/livekit.docker-compose.with-caddy-labels.yml',
                     '/calls/livekit.nginx.conf',
+                    '/guides/grafana-dashboard.json',
                     'CONTRIBUTING.md'
                 ]
             },