[sahara] add events definitions regarding new notifications

on sahara side we added new events related to current cluster
health. we want to collect statistic based on the cluster health,
like how many healthy clusters we have, and so on.
Health of the cluster will describe current state of cluster more
precisely.

Partially-implements blueprint: cluster-verification
Depends-On: Iac74a7bdec0f59a3720e17a682268faea36a45f3

Change-Id: Iea0f37cd2fe31e740a1ac5d02fd96c2f6b35495c

etc/ceilometer/event_definitions.yaml

@@ -144,6 +144,23 @@
       fields: _context_user_id
     resource_id:
       fields: payload.cluster_id
+- event_type: sahara.cluster.health
+  traits: &sahara_health
+    <<: *sahara_crud
+    verification_id:
+      fields: payload.verification_id
+    health_check_status:
+      fields: payload.health_check_status
+    health_check_name:
+      fields: payload.health_check_name
+    health_check_description:
+      fields: payload.health_check_description
+    created_at:
+      type: datetime
+      fields: payload.created_at
+    updated_at:
+      type: datetime
+      fields: payload.updated_at
 - event_type: ['identity.user.*', 'identity.project.*', 'identity.group.*', 'identity.role.*', 'identity.OS-TRUST:trust.*',
                'identity.region.*', 'identity.service.*', 'identity.endpoint.*', 'identity.policy.*']
   traits: &identity_crud