deprecate archive policy of Gnocchi dispatcher

Since we have Archive Policy Rule in Gnocchi, it doesn't make
any sense to configure archive policy here.

Change-Id: Ide510f355361737230efcd89ff78ff974bc96134

ceilometer/dispatcher/gnocchi.py

@@ -77,6 +77,10 @@ class ResourcesDefinition(object):
             self._event_attributes[name] = declarative.Definition(
                 name, attr_cfg, plugin_manager)
 
+        if self.cfg.get('archive_policy'):
+            LOG.warning("archive_policy in gnocchi resource definition is "
+                        "deprecated. Archive Policy Rule must be setup on "
+                        "Gnocchi side instead")
         self.metrics = {}
         for t in self.cfg['metrics']:
             archive_policy = self.cfg.get('archive_policy',

ceilometer/dispatcher/gnocchi_opts.py

@@ -23,6 +23,9 @@ dispatcher_opts = [
                help='Gnocchi project used to filter out samples '
                'generated by Gnocchi service activity'),
     cfg.StrOpt('archive_policy',
+               deprecated_for_removal=True,
+               deprecated_reason='Archive Policy Rule must be '
+               'setup on Gnocchi side instead',
                help='The archive policy to use when the dispatcher '
                'create a new metric.'),
     cfg.StrOpt('resources_definition_file',

releasenotes/notes/deprecate-archive-policy-7148be0948dde101.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    Any Archive Policy configuration in Ceilometer is deprecated. Archive
+    Policy Rules system of Gnocchi must be used instead.