Manage dashboards only for the current datasource

This change adds a new 'datasource' parameter to the dashboard metadata.
This way, the Grafana client state will manage only the dashboards that
match with the deployed datasource (either InfluxDB or Prometheus). For
backward compatibility, the client will always manage the dashboards
that don't set this new parameter.

Change-Id: Iac323d756aff6ca4180f4b648a1d02692ebf292b

grafana/client/init.sls

@@ -1,8 +1,10 @@
 {%- from "grafana/map.jinja" import client with context %}
 {%- if client.get('enabled', False) %}
 
+{%- set datasources = [] %}
 {%- for datasource_name, datasource in client.datasource.iteritems() %}
 
+{%- do datasources.append(datasource.type) %}
 grafana_client_datasource_{{ datasource_name }}:
   grafana3_datasource.present:
   - name: {{ datasource.name|default(datasource_name) }}
@@ -63,6 +65,7 @@ grafana_client_datasource_{{ datasource_name }}:
 {%- endfor %}
 
 {%- for dashboard_name, dashboard in final_dict.iteritems() %}
+{%- if dashboard.datasource is not defined or dashboard.datasource in datasources %}
   {%- if dashboard.get('enabled', True) %}
 grafana_client_dashboard_{{ dashboard_name }}:
   grafana3_dashboard.present:
@@ -88,6 +91,7 @@ grafana_client_dashboard_{{ dashboard_name }}:
   grafana3_dashboard.absent:
   - name: {{ dashboard_name }}
   {%- endif %}
+{%- endif %}
 {%- endfor %}
 
 {%- endif %}

grafana/meta/grafana.yml

@@ -1,13 +1,16 @@
 dashboard:
   grafana:
+    datasource: influxdb
     format: json
     template: grafana/files/grafana_dashboards/grafana_influxdb.json
   main:
+    datasource: influxdb
     format: yaml
     base_dashboards: ['grafana:client:base_templates:main_dashboard']
     base_rows: ['grafana:client:base_templates:service_row']
     base_panels: ['grafana:client:base_templates:cluster_status_singlestat']
   service_level:
+    datasource: influxdb
     format: yaml
     base_dashboards: ['grafana:client:base_templates:service_level_dashboard']
     base_rows: ['grafana:client:base_templates:service_level_row']