Add Promtail and Loki support for viewing Logs in Grafana (#20)

* add promtail loki support

* updated images and removed arch directives in docker-compose

* fix grafana logs

* add restart-grafana make command

* clean up enhanced logs dashboard

* update both mattermost servers to use the same version

* update docker-compose and promtail config to use host path mounts for logs

* clean up dashboard for good

files/grafana/provisioning/datasources/automatic.yml

@@ -1,17 +1,31 @@
 apiVersion: 1
 
 datasources:
-- name: mattermost
-  type: prometheus
-  access: proxy
-  url: http://prometheus:9090
-  password:
-  user:
-  database: 
-  isDefault: true
-  jsonData:
-     tlsAuth: false
-     tlsAuthWithCACert: false
-     httpMethod: "POST"
-  version: 1
-  editable: true
+   - name: mattermost
+     type: prometheus
+     access: proxy
+     url: http://prometheus:9090
+     password:
+     user:
+     database:
+     isDefault: true
+     jsonData:
+        tlsAuth: false
+        tlsAuthWithCACert: false
+        httpMethod: "POST"
+     version: 1
+     editable: true
+   - name: loki
+     type: loki
+     access: proxy
+     url: http://loki:3100
+     password:
+     user:
+     database:
+     isDefault: false
+     jsonData:
+        tlsAuth: false
+        tlsAuthWithCACert: false
+        httpMethod: "POST"
+     version: 1
+     editable: true