Add configuration option for heartbeat_in_pthread

This configuration option has been observed to result in file
descriptor leaks in certain circumstances. A variable is added
here so that it can be easily overridden.

Depends-On: https://review.opendev.org/c/openstack/openstack-ansible/+/835548
Change-Id: I833d72715daff81b64da077e899615b9b2002650
Related-Bug: #1961603
(cherry picked from commit 01951cd77b)

defaults/main.yml

@@ -230,6 +230,10 @@ neutron_galera_port: "{{ galera_port | default('3306') }}"
 ### Oslo Messaging
 ###
 
+# RabbitMQ
+
+neutron_oslomsg_heartbeat_in_pthread: "{{ oslomsg_heartbeat_in_pthread | default(False) }}"
+
 # RPC
 
 neutron_oslomsg_rpc_host_group: "{{ oslomsg_rpc_host_group | default('rabbitmq_all') }}"

releasenotes/notes/heartbeat-in-pthread-9f5fde7bfdd7d306.yaml

@@ -0,0 +1,5 @@
+---
+fixes:
+  - |
+    Fixes a file descriptor leak which may impact services which use the
+    oslo.messaging RabbitMQ heartbeat mechanism.

templates/neutron.conf.j2

@@ -221,6 +221,7 @@ root_helper_daemon = sudo {{ neutron_bin }}/neutron-rootwrap-daemon {{ neutron_c
 # Messaging
 [oslo_messaging_rabbit]
 rpc_conn_pool_size = {{ neutron_rpc_conn_pool_size }}
+heartbeat_in_pthread = {{ neutron_oslomsg_heartbeat_in_pthread }}
 
 # Notifications
 [oslo_messaging_notifications]