docs: adding more details for monitoring and operations

docs/MONITORING.md

@@ -52,6 +52,13 @@ Config: `monitoring/prometheus/prometheus.yml` (15s scrape interval)
 - **Linear Void app**: `monitoring/grafana/dashboard.json` — clients, messages, moderation, Redis, sessions, scrape health
 - **Prometheus ops**: `monitoring/grafana/dashboards/dashboard.json` — TSDB, CPU/memory, WAL, compactions, query latency
 
+## Metrics checking
+
+See detailed scripts for querying Prometheus scrape targets:
+
+- [Linux/macOS](./infrastructure/monitoring/prometheus_curl.md)
+- [Windows](./infrastructure/monitoring/prometheus_curl_win.md)
+
 ## Key Metrics
 
 - `linearvoid_chat_connected_clients` — active WebSocket connections