Add classes for Gnocchi archive policies implementation

Change-Id: I77d5334075d60c34611ed920ee538fbe3990da13
Related-Prod: https://mirantis.jira.com/browse/PROD-20813
Depends-On: I7341dfb26a39275e1a9b55f7a49fd2ace9584612
diff --git a/ceilometer/server/backend/gnocchi.yml b/ceilometer/server/backend/gnocchi.yml
new file mode 100644
index 0000000..9eca73b
--- /dev/null
+++ b/ceilometer/server/backend/gnocchi.yml
@@ -0,0 +1,19 @@
+classes:
+- service.ceilometer.server.publisher.panko
+parameters:
+  _param:
+    openstack_event_alarm_topic: alarm.all
+    ceilometer_create_gnocchi_resources: false
+    ceilometer_gnocchi_filter_project: service
+  # gnocchi and panko are default backends for Ceilometer since Pike
+  # they are incompatible with any legacy database publisher backends
+  ceilometer:
+    server:
+      publisher:
+        gnocchi:
+          enabled: true
+          url: "gnocchi://?filter_project=${_param:ceilometer_gnocchi_filter_project}"
+          publish_metric: true
+          # filter_project is deprecated since queens
+          filter_project: ${_param:ceilometer_gnocchi_filter_project}
+          create_resources: ${_param:ceilometer_create_gnocchi_resources}