Keep Ceilometer api enabled for Ocata Undercloud

Due to the deprecation policy and giving our users more
time to switch to gnocchi/aodh/panko, We will continue
running ceilometer API for one more release.

This will be set to false in pike release as per deprecation
policy guidelines. Users are expected to completely switch
to other supported services by then.

This support was added in I9e77ed7d285c69d89aea1f62a098a25619c57420

Change-Id: Ib13b097aa242ad4bf5a0177a28ba4d2dae4dca5f

elements/puppet-stack-config/puppet-stack-config.pp

@@ -156,7 +156,7 @@ if str2bool(hiera('enable_telemetry', true)) {
   include ::ceilometer::keystone::auth
   include ::aodh::keystone::auth
   include ::ceilometer
-  if str2bool(hiera('enable_legacy_ceilometer_api', false)) {
+  if str2bool(hiera('enable_legacy_ceilometer_api', true)) {
     include ::ceilometer::api
   }
   include ::ceilometer::wsgi::apache

instack_undercloud/undercloud.py

@@ -306,9 +306,12 @@ _opts = [
                 help=('Whether to install the Volume service to be boot '
                       'overcloud nodes from remote volumes.')),
     cfg.BoolOpt('enable_legacy_ceilometer_api',
-                default=False,
+                default=True,
                 help=('Whether to enable legacy ceilometer api '
-                      'in the Undercloud.')
+                      'in the Undercloud. '
+                      'Note: Ceilometer API has been deprecated and will be '
+                      'removed in future release. Please consider moving to '
+                      'gnocchi/Aodh/Panko API instead.')
                 ),
     cfg.BoolOpt('ipxe_enabled',
                 default=True,

undercloud.conf.sample

@@ -163,7 +163,7 @@
 
 # Whether to enable legacy ceilometer api service in the
 # Undercloud. (boolean value)
-#enable_legacy_ceilometer_api = false
+#enable_legacy_ceilometer_api = true
 
 # Whether to use iPXE for deploy and inspection. (boolean value)
 # Deprecated group/name - [DEFAULT]/ipxe_deploy