restore volume for grafana

docker-compose.yml

@@ -4,6 +4,9 @@ networks:
     monitor-net:
         driver: bridge
 
+volumes:
+    grafana_data: {}
+
 services:
     alertmanager:
         image: prom/alertmanager:v0.21.0
@@ -48,10 +51,9 @@ services:
         container_name: grafana
         hostname: grafana
         restart: unless-stopped
-        user: "$UID:$GID"
 
         volumes:
-            - ./grafana/etc/var/lib/grafana:/var/lib/grafana
+            - grafana_data:/var/lib/grafana
             - ./grafana/provisioning:/etc/grafana/provisioning
         environment:
             - GF_SECURITY_ADMIN_USER=${ADMIN_USER:-admin}