Configure Prometheus Pushgateway Options

Adds the ability to configure the Prometheus Pushgateway options
alongside the rest of kolla-ansible's configurations.

Closes-Bug: #1968597
Signed-off-by: Juan Pablo Suazo <jsuazo@whitestack.com>
Change-Id: I2d20288267ceda95076229628db10299ddbde31f

ansible/roles/ceilometer/defaults/main.yml

@@ -193,3 +193,9 @@ ceilometer_upgrade_params: ""
 ####################
 ceilometer_prometheus_pushgateway_host: "127.0.0.1"
 ceilometer_prometheus_pushgateway_port: "9091"
+## Options
+ceilometer_prometheus_pushgateway_options:
+#  timeout: 180
+#  max_retries: 5
+#  batch: no
+#  verify_ssl: no

ansible/roles/ceilometer/templates/pipeline.yaml.j2

@@ -12,5 +12,5 @@ sinks:
           - gnocchi://
 {% endif %}
 {% if enable_ceilometer_prometheus_pushgateway | bool %}
-          - prometheus://{{ ceilometer_prometheus_pushgateway_host }}:{{ ceilometer_prometheus_pushgateway_port }}/metrics/job/openstack-telemetry
+          - prometheus://{{ ceilometer_prometheus_pushgateway_host }}:{{ ceilometer_prometheus_pushgateway_port }}/metrics/job/openstack-telemetry{% if ceilometer_prometheus_pushgateway_options %}/?{{ (ceilometer_prometheus_pushgateway_options|dict2items|rejectattr("value", "equalto", None)|list|items2dict).items() | map("join", "=") | join("&")}}{% endif %}
 {% endif %}

releasenotes/notes/feature-1968597-4b414566f82c90fa.yaml

@@ -0,0 +1,28 @@
+---
+features:
+  - |
+    Adds ability to configure the Prometheus pushgateway options of its URL.
+
+    Adds a new variable ``ceilometer_prometheus_pushgateway_options``. This is
+    a dictionary whose keys are the options to be set and its values contain
+    what to set them to.
+
+    These options and respective values are then added to the pushgateway's
+    URL, checking that no "None" value is being set.
+
+    For example, the following configurations:
+
+    .. code-block:: yaml
+
+      ceilometer_prometheus_pushgateway_host: "127.0.0.1"
+      ceilometer_prometheus_pushgateway_port: "9091"
+      ceilometer_prometheus_pushgateway_options:
+          timeout: 180
+          max_retries:
+          verify_ssl: yes
+
+    Result in the following URL:
+    ``prometheus://127.0.0.1:9091/ \
+    metrics/job/openstack-telemetry/?timeout=180&verify_ssl=True``
+
+    `LP#1968597 <https://bugs.launchpad.net/kolla-ansible/+bug/1968597>`__