Add observer, prometheus and grafana

docker/grafana/provisioning/datasources/prometheus.yml

@@ -0,0 +1,9 @@
+apiVersion: 1
+
+datasources:
+  - name: Prometheus
+    type: prometheus
+    access: proxy
+    url: http://prometheus:9090   # имя сервиса Prometheus в docker-compose
+    isDefault: true
+    editable: false