Grafana datasource and dashboard provisioning, initial versions (#532)

*  Grafana datasource and dashboard provisioning

 - Datasource (Prometheus) definition for docker network
 - Local and global dashboard stored as JSON in repo

Warning: If you make change to the datasources or dashboards in
Grafana UI and save them (to grafana.db), these definitions will
be overwritten upon start.
Export dashboards as JSON and update their files!

*  Update grafana dashboard

tools/docker-network/.gitignore

 *.txt
-grafana
\ No newline at end of file
+grafana/grafana.db
+grafana/plugins
+grafana/png

tools/docker-network/docker-compose.yml

@@ -93,6 +93,10 @@ services:
     image: grafana/grafana:latest
     container_name: grafana
     restart: unless-stopped
+    environment:
+      # path to provisioning definitions can only be defined as
+      # environment variables for grafana within docker
+      - GF_PATHS_PROVISIONING=/var/lib/grafana/provisioning
     ports:
     - 3000:3000
     user: "104"

tools/docker-network/grafana/provisioning/dashboards/dashboards.yaml

+apiVersion: 1
+
+providers:
+  # <string> an unique provider name. Required
+  - name: 'Goshimmer Local Metrics'
+    # <int> Org id. Default to 1
+    orgId: 1
+    # <string> name of the dashboard folder.
+    folder: ''
+    # <string> folder UID. will be automatically generated if not specified
+    folderUid: ''
+    # <string> provider type. Default to 'file'
+    type: file
+    # <bool> disable dashboard deletion
+    disableDeletion: false
+    # <bool> enable dashboard editing
+    editable: true
+    # <int> how often Grafana will scan for changed dashboards
+    updateIntervalSeconds: 10
+    # <bool> allow updating provisioned dashboards from the UI
+    allowUiUpdates: true
+    options:
+      # <string, required> path to dashboard files on disk. Required when using the 'file' type
+      path: /var/lib/grafana/dashboards

tools/docker-network/grafana/provisioning/datasources/datasources.yaml

+# config file version
+apiVersion: 1
+
+# list of datasources to insert/update depending
+# what's available in the database
+datasources:
+  # <string, required> name of the datasource. Required
+  - name: Prometheus
+    # <string, required> datasource type. Required
+    type: prometheus
+    # <string, required> access mode. proxy or direct (Server or Browser in the UI). Required
+    access: direct
+    # <int> org id. will default to orgId 1 if not specified
+    orgId: 1
+    # <string> custom UID which can be used to reference this datasource in other parts of the configuration, if not specified will be generated automatically
+    uid:
+    # <string> url
+    url: http://localhost:9090
+    # <string> Deprecated, use secureJsonData.password
+    password:
+    # <string> database user, if used
+    user:
+    # <string> database name, if used
+    database:
+    # <bool> enable/disable basic auth
+    basicAuth:
+    # <string> basic auth username
+    basicAuthUser:
+    # <string> Deprecated, use secureJsonData.basicAuthPassword
+    basicAuthPassword:
+    # <bool> enable/disable with credentials headers
+    withCredentials:
+    # <bool> mark as default datasource. Max one per org
+    isDefault:
+    # <map> fields that will be converted to json and stored in jsonData
+    jsonData:
+      graphiteVersion: '1.1'
+      tlsAuth: true
+      tlsAuthWithCACert: true
+      timeInterval: '1s'
+    # <string> json object of data that will be encrypted.
+    secureJsonData:
+      tlsCACert: '...'
+      tlsClientCert: '...'
+      tlsClientKey: '...'
+      # <string> database password, if used
+      password:
+      # <string> basic auth password
+      basicAuthPassword:
+    version: 1
+    # <bool> allow users to edit datasources from the UI.
+    editable: true