parametrize timeInterval for Prometheus source

Necessary to match Prometheus scrape interval.

Signed-off-by: Jakub Sokołowski <jakub@status.im>

defaults/main.yml

@@ -18,7 +18,7 @@ grafana_domain: ~
 
 # Main configuration for sources
 grafana_prometheus_sources: []
-#  - { name: 'node-01', addr: '1.2.3.4', port: 8080, path: 'proxy/' }
+#  - { name: 'node-01', addr: '1.2.3.4', port: 8080, path: 'proxy/', interval: 30 }
 
 # Admin user
 grafana_username: ~

templates/prometheus.yml.j2

@@ -9,6 +9,7 @@ datasources:
   url: http://{{ service.addr }}:{{ service.port }}/{{ service.path | default("") }}
   withCredentials: false
   isDefault: {{ loop.first }}
+  timeInterval: {{ service.interval | default(30) }}
   jsonData:
     httpMethod: GET
     tlsAuth: false