Loki configuration

docker/grafana/Dockerfile

@@ -1 +1,5 @@
-FROM grafana/grafana:latest
+FROM grafana/grafana:latest
+RUN mkdir -p /etc/grafana/provisioning/datasources /etc/grafana/provisioning/dashboards
+COPY custom.ini /etc/grafana/grafana.ini 
+COPY loki_datasource.yaml /etc/grafana/provisioning/datasources/
+COPY dashboard.json /etc/grafana/provisioning/dashboards/ 

docker/grafana/custom.ini

@@ -0,0 +1,11 @@
+datasources:
+  - name: Loki
+    type: loki
+    access: proxy  # Access mode: 'proxy' (default) or 'direct' 
+    url: http://loki_loki
+    jsonData:
+      maxLines: 1000 # Maximum number of lines returned per query
+    # basicAuth:
+    #   username: myuser
+    #   password: mypassword 
+default_home_dashboard = Loki 

docker/grafana/dashboard.json

@@ -0,0 +1,17 @@
+{
+    "title": "Loki",
+    "panels": [
+      {
+        "title": "Error Rate",
+        "type": "graph",
+        "datasource": "Loki", 
+        "targets": [
+          {
+            "expr": 'sum(rate({job="my-app", level="error"}[1m])) by (level)',
+            "legendFormat": "{{level}}",
+            "refId": "A" 
+          }
+        ]
+      }
+    ]
+  }

docker/grafana/loki_datasource.yaml

@@ -0,0 +1,7 @@
+apiVersion: 1
+
+datasources:
+  - name: Loki
+    type: loki
+    access: proxy
+    url: http://loki_loki:3100