Deprecate ceilometer collector

Change-Id: I038e346d602552c449642c71bc30d2b7d2d1b54d

manifests/collector.pp

@@ -68,6 +68,8 @@ class ceilometer::collector (
   include ::ceilometer::deps
   include ::ceilometer::params
 
+  warning('This class is deprecated. Now the pipeline.yaml can be configured directly to send data eg: gnocchi://')
+
   # We accept udp_address to be set to empty instead of the usual undef to stay
   # close to the "strange" upstream interface.
   if (is_ip_address($udp_address) != true and $udp_address != '' ){

releasenotes/notes/deprecate-collector-55d615ff6cfff86a.yaml

@@ -0,0 +1,6 @@
+---
+deprecations:
+  - Ceilometer collector is deprecated in pike release. Configure the
+    publisher directly instead to decide where the data should be sent
+    in pipeline.yaml. For example, set publisher to gnocchi:// to send
+    the data from ceilometer to gnocchi and bypass collector completely.