Add override timeout for openstack exporter

Add scrape_timeout option in
prometheus_openstack_exporter job in order
to avoid timeout for large Openstack environment.

Change-Id: If96034e602bee3b3eea34a2656047355e1d17eec
Closes-Bug: #1903547
(cherry picked from commit 76d2b98)
(cherry picked from commit da1124c)

Author: Alban Lecorps

ansible/group_vars/all.yml

@@ -1109,6 +1109,7 @@ enable_prometheus_blackbox_exporter: "{{ enable_prometheus | bool }}"
 prometheus_alertmanager_user: "admin"
 prometheus_libvirt_exporter_interval: "60s"
 prometheus_openstack_exporter_interval: "60s"
+prometheus_openstack_exporter_timeout: "10s"
 prometheus_elasticsearch_exporter_interval: "60s"
 prometheus_cmdline_extras:
 prometheus_ceph_mgr_exporter_endpoints: []

ansible/roles/prometheus/templates/prometheus.yml.j2

@@ -78,6 +78,7 @@ scrape_configs:
 {% if enable_prometheus_openstack_exporter | bool %}
   - job_name: openstack_exporter
     scrape_interval: {{ prometheus_openstack_exporter_interval }}
+    scrape_timeout: {{ prometheus_openstack_exporter_timeout }}
     honor_labels: true
     static_configs:
       - targets:

releasenotes/notes/add-openstack-exporter-scrape-timeout-af5dcd5d988ae12b.yaml

@@ -0,0 +1,4 @@
+---
+features:
+  - Add new option prometheus_openstack_exporter_timeout to override default
+    scrape_timeout for openstack exporter job.