Merge "Deprecate unused [coordination] check_watchers"

ceilometer/opts.py

@@ -90,6 +90,8 @@ def list_opts():
             cfg.FloatOpt(
                 'check_watchers',
                 default=10.0,
+                deprecated_for_removal=True,
+                deprecated_reason='This parameter is no longer used.',
                 help='Number of seconds between checks to see if group '
                 'membership has changed'),
         ]),

releasenotes/notes/bug-1929178-a8243526ce2311f7.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    The ``[coordination] check_watchers`` parameter has been deprecated since
+    it has been ineffective.