[gnocchi] Disable statsd daemon by default

This daemon is an additional piece of functionality supported by Gnocchi
and the general pattern in KA is to disable such things unless the user
explicitly wants them. This also helps avoid having to set the
resource_id, user_id, and project_id variables for Gnocchi if you don't
care about this daemon.

Change-Id: I5f14cee4b0bb0d781b1ff53200d11de972d20c82

ansible/group_vars/all.yml

@@ -566,6 +566,7 @@ enable_etcd: "no"
 enable_fluentd: "yes"
 enable_freezer: "no"
 enable_gnocchi: "no"
+enable_gnocchi_statsd: "no"
 enable_grafana: "no"
 enable_heat: "{{ enable_openstack_core | bool }}"
 enable_horizon: "{{ enable_openstack_core | bool }}"

ansible/roles/gnocchi/defaults/main.yml

@@ -30,7 +30,7 @@ gnocchi_services:
   gnocchi-statsd:
     container_name: gnocchi_statsd
     group: gnocchi-statsd
-    enabled: true
+    enabled: "{{ enable_gnocchi_statsd | bool }}"
     image: "{{ gnocchi_statsd_image_full }}"
     volumes: "{{ gnocchi_statsd_default_volumes + gnocchi_statsd_extra_volumes }}"
     dimensions: "{{ gnocchi_statsd_dimensions }}"

ansible/roles/gnocchi/templates/gnocchi.conf.j2

@@ -27,13 +27,14 @@ max_pool_size = 50
 max_overflow = 1000
 max_retries = -1
 
+{% if enable_gnocchi_statsd | bool %}
 [statsd]
 resource_id = {{ gnocchi_resource_id }}
 user_id = {{ gnocchi_user_id }}
 project_id = {{ gnocchi_project_id }}
 archive_policy_name = low
-
 flush_delay = 10
+{% endif %}
 
 [metricd]
 workers = {{ gnocchi_metricd_workers }}

etc/kolla/globals.yml

@@ -253,6 +253,7 @@
 #enable_fluentd: "yes"
 #enable_freezer: "no"
 #enable_gnocchi: "no"
+#enable_gnocchi_statsd: "no"
 #enable_grafana: "no"
 #enable_heat: "{{ enable_openstack_core | bool }}"
 #enable_horizon: "{{ enable_openstack_core | bool }}"

releasenotes/notes/default-disable-gnocchi-statsd-f7aa933f342ce2b0.yaml

@@ -0,0 +1,7 @@
+---
+upgrade:
+  - |
+    The `gnocchi-statsd <https://gnocchi.osci.io/statsd.html>`__ daemon is
+    no longer enabled by default. If you are using the daemon, you
+    will need to set ``enable_gnocchi_statsd: "yes"`` to continue using
+    it in your deployment.