Bump prometheus-openstack-exporter version to 1.6.0

Change-Id: I4bd581c3ea422e1c9a075a71721413d47fdbdfe4
Depends-On: https://review.opendev.org/c/openstack/kolla-ansible/+/847538
(cherry picked from commit 5f94e53)

Author: priteau

docker/prometheus/prometheus-openstack-exporter/Dockerfile.j2

@@ -6,15 +6,15 @@ LABEL maintainer="{{ maintainer }}" name="{{ image_name }}" build-date="{{ build
 {% block prometheus_openstack_exporter_header %}{% endblock %}
 
 {% block prometheus_openstack_exporter_repository_version %}
-ARG prometheus_openstack_exporter_version=1.3.0
-ARG prometheus_openstack_exporter_url=https://github.com/openstack-exporter/openstack-exporter/releases/download/v${prometheus_openstack_exporter_version}/openstack-exporter-${prometheus_openstack_exporter_version}.linux-{{debian_arch}}.tar.gz
+ARG prometheus_openstack_exporter_version=1.6.0
+ARG prometheus_openstack_exporter_url=https://github.com/openstack-exporter/openstack-exporter/releases/download/v${prometheus_openstack_exporter_version}/openstack-exporter_${prometheus_openstack_exporter_version}_linux_{{debian_arch}}.tar.gz
 {% endblock %}
 
 {% block prometheus_openstack_exporter_install %}
 RUN curl -o /tmp/prometheus_openstack_exporter.tar.gz ${prometheus_openstack_exporter_url} \
-    && tar xvf /tmp/prometheus_openstack_exporter.tar.gz -C /opt/ \
-    && rm -f /tmp/prometheus_openstack_exporter.tar.gz \
-    && ln -s /opt/openstack-exporter* /opt/openstack-exporter
+    && mkdir /opt/openstack-exporter \
+    && tar xvf /tmp/prometheus_openstack_exporter.tar.gz -C /opt/openstack-exporter \
+    && rm -f /tmp/prometheus_openstack_exporter.tar.gz
 {% endblock %}
 
 {% block prometheus_openstack_exporter_footer %}{% endblock %}

releasenotes/notes/openstack-exporter-1.6.0-cb2c1a978cf4be64.yaml

@@ -0,0 +1,11 @@
+---
+features:
+  - |
+    Updates the OpenStack exporter for Prometheus to `version 1.6.0
+    <https://github.com/openstack-exporter/openstack-exporter/releases/tag/v1.6.0>`__.
+upgrade:
+  - |
+    The updated OpenStack exporter for Prometheus uses the latest Nova API
+    microversion by default, resulting in changes to existing metrics. To keep
+    existing behaviour, set
+    ``prometheus_openstack_exporter_compute_api_version`` to ``2.1``.