feat: monitoring - grafana dashboards, alertmanager alerting rules

hosts/idols_ruby/grafana/datasources.yml

@@ -0,0 +1,21 @@
+# https://grafana.com/docs/grafana/latest/datasources/prometheus/
+apiVersion: 1
+
+datasources:
+  - name: prometheus-homelab
+    type: prometheus
+    access: proxy
+    # Access mode - proxy (server in the UI) or direct (browser in the UI).
+    url: http://localhost:9090
+    jsonData:
+      httpMethod: POST
+      manageAlerts: true
+      prometheusType: Prometheus
+      prometheusVersion: 2.49.0
+      cacheLevel: 'High'
+      disableRecordingRules: false
+      # As of Grafana 10, the Prometheus data source can be configured to query live dashboards 
+      # incrementally, instead of re-querying the entire duration on each dashboard refresh.
+      # Increasing the duration of the incrementalQueryOverlapWindow will increase the size of every incremental query, 
+      # but might be helpful for instances that have inconsistent results for recent data.
+      incrementalQueryOverlapWindow: 10m