feat: initial alert rules

rules/network.yaml

@@ -0,0 +1,28 @@
+apiVersion: monitoring.coreos.com/v1
+kind: PrometheusRule
+metadata:
+  name: k8s-network-rules
+  namespace: monitoring
+  labels:
+    release: monitoring
+spec:
+  groups:
+    - name: network.critical
+      rules:
+        - alert: CoreDNSDown
+          expr: absent(up{job="coredns"} == 1)
+          for: 5m
+          labels:
+            severity: critical
+          annotations:
+            summary: "CoreDNS inaccessible"
+            description: "CoreDNS est indisponible, la résolution DNS interne est cassée."
+
+        - alert: KubeAPIServerLatencyHigh
+          expr: histogram_quantile(0.99, sum(rate(apiserver_request_duration_seconds_bucket{verb!~"WATCH|LIST"}[5m])) by (le)) > 1
+          for: 5m
+          labels:
+            severity: critical
+          annotations:
+            summary: "Latence API Server élevée"
+            description: "La latence p99 de l'API server dépasse 1 seconde."