Deprecate support for [oslo_messaging_rabbit] heartbeat_in_pthread

... because the option has been deprecated.

Depends-on: https://review.opendev.org/925778
Change-Id: Ie29ece185b3efb25f7b251743b7a82f1108ce5c9

manifests/init.pp

@@ -104,16 +104,6 @@
 #   we check the heartbeat. (integer value)
 #   Defaults to $facts['os_service_default']
 #
-# [*rabbit_heartbeat_in_pthread*]
-#   (Optional) EXPERIMENTAL: Run the health check heartbeat thread
-#   through a native python thread. By default if this
-#   option isn't provided the  health check heartbeat will
-#   inherit the execution model from the parent process. By
-#   example if the parent process have monkey patched the
-#   stdlib by using eventlet/greenlet then the heartbeat
-#   will be run through a green thread.
-#   Defaults to $facts['os_service_default']
-#
 #  [*rabbit_qos_prefetch_count*]
 #   (Optional) Specifies the number of messages to prefetch.
 #   Defaults to $facts['os_service_default']
@@ -172,6 +162,18 @@
 #   IP address.
 #   Defaults to $facts['os_service_default'].
 #
+# DEPRECATED PARAMETERS
+#
+# [*rabbit_heartbeat_in_pthread*]
+#   (Optional) EXPERIMENTAL: Run the health check heartbeat thread
+#   through a native python thread. By default if this
+#   option isn't provided the  health check heartbeat will
+#   inherit the execution model from the parent process. By
+#   example if the parent process have monkey patched the
+#   stdlib by using eventlet/greenlet then the heartbeat
+#   will be run through a green thread.
+#   undef
+#
 class ceilometer(
   $telemetry_secret,
   $http_timeout                       = $facts['os_service_default'],
@@ -194,7 +196,6 @@ class ceilometer(
   $rabbit_enable_cancel_on_failover   = $facts['os_service_default'],
   $rabbit_heartbeat_timeout_threshold = $facts['os_service_default'],
   $rabbit_heartbeat_rate              = $facts['os_service_default'],
-  $rabbit_heartbeat_in_pthread        = $facts['os_service_default'],
   $rabbit_qos_prefetch_count          = $facts['os_service_default'],
   $amqp_durable_queues                = $facts['os_service_default'],
   $rabbit_use_ssl                     = $facts['os_service_default'],
@@ -207,6 +208,8 @@ class ceilometer(
   $kombu_compression                  = $facts['os_service_default'],
   Boolean $purge_config               = false,
   $host                               = $facts['os_service_default'],
+  # DEPRECATED PARAMETERS
+  $rabbit_heartbeat_in_pthread        = undef,
 ) {
 
   include ceilometer::deps

releasenotes/notes/deprecate-rabbit_heartbeat_in_pthread-781a490b7b7a9060.yaml

@@ -0,0 +1,5 @@
+---
+deprecations:
+  - |
+    The ``ceilometer::rabbit_heartbeat_in_pthread`` parameter has been
+    deprecated and will be removed in the future release.