added alerting rules for grafana

docker-compose/monitoring-grafana-promethues-cadvisor-node-exporter/docker-compose.yml

@@ -33,10 +33,20 @@ services:
     container_name: grafana
     restart: unless-stopped
     ports:
-      - "3000:3000"                    # keep for now
+      - "3000:3000"
+    env_file:
+      - .env
+    environment:
+      - GF_SMTP_ENABLED=true
+      - GF_SMTP_HOST=smtp.gmail.com:587
+      - GF_SMTP_USER=${GMAIL_SMTP_USER}
+      - GF_SMTP_PASSWORD=${GMAIL_APP_PASSWORD}
+      - GF_SMTP_FROM_ADDRESS=${GMAIL_SMTP_USER}
+      - GF_SMTP_FROM_NAME=Grafana Alerts
     volumes:
       - ./grafana/data:/var/lib/grafana
       - ./grafana/provisioning/datasources:/etc/grafana/provisioning/datasources:ro
+      - ./grafana/provisioning/alerting:/etc/grafana/provisioning/alerting:ro
     networks:
       - monitoring
       - web_net