monitoring: Add feature toggles to grafana config

This change allows to activate the new alerts 2.0 with the ngalert flag.

roles/monitoring/defaults/main.yml

@@ -59,6 +59,9 @@ monitoring_grafana_oauth:
   client_id: "grafana"
   client_secret: "something-secret123"
 
+# Additional feature toggles to enable (See https://grafana.com/docs/grafana/latest/administration/configuration/#feature_toggles)
+monitoring_grafana_feature_toggles: []
+
 # The influxdb admin credentials that should be created
 monitoring_influxdb_admin_username: "admin"
 monitoring_influxdb_admin_password: "{{ lookup('passwordstore',  monitoring_influxdb_domain +  '/db-admin create=true length=42') }}"

roles/monitoring/templates/docker-compose.yml

@@ -48,6 +48,10 @@ services:
       - "GF_AUTH_GENERIC_OAUTH_ROLE_ATTRIBUTE_PATH=contains(roles[*], 'Admin') && 'Admin' || contains(roles[*], 'Editor') && 'Editor' || 'Viewer'"
 {% endif %}
 
+{% if monitoring_grafana_feature_toggles is defined and monitoring_grafana_feature_toggles is iterable and monitoring_grafana_feature_toggles | length > 0 %}
+      - "GF_FEATURE_TOGGLES_ENABLE={% for item in monitoring_grafana_feature_toggles %}{{item}} {% endfor %}"
+{% endif %}
+
     restart: always
     labels:
       - "traefik.enable=true"