Add apm-server to loadbalancer

Change-Id: I7442296d0ff984839e7f63ffcf82a77db722b72e

elk_metrics_6x/readme.rst

@@ -69,6 +69,22 @@ Configure the Kibana endpoints:
           haproxy_port: 81  # This is set using the "Kibana_nginx_port" variable
           haproxy_balance_type: tcp
 
+Configure the APM endpoints:
+  It is recommented to use a load balancer for submitting Application
+  Performance Monitoring data to the APM server. A load balancer will provide
+  a highly available address which APM clients can use to connect to a pool of
+  APM nodes. If using HAProxy, edit the `/etc/openstack_deploy/user_variables.yml`
+  and add the following lines
+
+.. code-block:: yaml
+
+    haproxy_extra_services:
+      - service:
+          haproxy_service_name: apm-server
+          haproxy_ssl: False
+          haproxy_backend_nodes: "{{ groups['apm-server'] | default([]) }}"
+          haproxy_port: 8200 # this is set using the "apm_port" variable
+          haproxy_balance_type: tcp
 
 Optional | add OSProfiler to an OpenStack-Ansible deployment
 ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

elk_metrics_6x/templates/apm-server.yml.j2

@@ -4,7 +4,7 @@
 
 apm-server:
   # Defines the host and port the server is listening on
-  #host: "localhost:8200"
+  host: "{{ apm_interface }}:{{ apm_port }}"
 
   # Maximum permitted size in bytes of an unzipped request accepted by the server to be processed.
   #max_unzipped_size: 52428800

elk_metrics_6x/vars/variables.yml

@@ -41,6 +41,10 @@ kibana_server_name: "{{ ansible_hostname }}"
 logstash_beat_input_port: 5044
 logstash_deploy_filters: true
 
+# APM vars
+apm_interface: 0.0.0.0
+apm_port: 8200
+
 # Beat options
 heartbeat_services:
   - group: "{{ groups['galera_all'] | default([]) }}"