feat: add Prometheus alert rules and update docker-compose

Author: imane-ait

docker-compose.yml

@@ -33,6 +33,7 @@ services:
       - "9090:9090"
     volumes:
       - ./monitoring/prometheus.yml:/etc/prometheus/prometheus.yml
+      - ./monitoring/alerts.yml:/etc/prometheus/alerts.yml
     depends_on:
       - app
 

monitoring/alerts.yml

@@ -0,0 +1,47 @@
+groups:
+  - name: fleetops-alerts
+    rules:
+      - alert: HighErrorRate
+        expr: rate(http_requests_total{status=~"5.."}[5m]) / rate(http_requests_total[5m]) > 0.05
+        for: 1m
+        labels:
+          severity: critical
+        annotations:
+          summary: "Taux d'erreurs élevé"
+          description: "Plus de 5% des requêtes retournent une erreur 5xx depuis 1 minute."
+
+      - alert: HighLatency
+        expr: histogram_quantile(0.95, rate(http_request_duration_seconds_bucket[5m])) > 0.3
+        for: 2m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Latence p95 élevée"
+          description: "La latence p95 dépasse 300ms depuis 2 minutes."
+
+      - alert: AppDown
+        expr: up{job="fleetops-api"} == 0
+        for: 30s
+        labels:
+          severity: critical
+        annotations:
+          summary: "Application indisponible"
+          description: "L'app FleetOps ne répond plus depuis 30 secondes."
+
+      - alert: HighRequestRate
+        expr: rate(http_requests_total[5m]) > 10
+        for: 1m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Trafic élevé"
+          description: "Plus de 10 requêtes par seconde depuis 1 minute."
+
+      - alert: NoTraffic
+        expr: rate(http_requests_total[5m]) == 0
+        for: 5m
+        labels:
+          severity: warning
+        annotations:
+          summary: "Aucun trafic"
+          description: "Aucune requête reçue depuis 5 minutes."

monitoring/prometheus.yml

@@ -1,7 +1,8 @@
 global:
   scrape_interval: 15s
   evaluation_interval: 15s
-
+rule_files:
+  - "alerts.yml"
 scrape_configs:
   - job_name: 'fleetops-api'
     static_configs: