Remove variables not available in prometheus 2.0

Closes-Bug: PROD-16609
Change-Id: I4865b92fa1ca46e3c8d5e1bbbb5855aff337726f
diff --git a/.releasenotes/notes/prometheus-2.0-2a7b3bc4ad76e118.yaml b/.releasenotes/notes/prometheus-2.0-2a7b3bc4ad76e118.yaml
new file mode 100644
index 0000000..6ba618b
--- /dev/null
+++ b/.releasenotes/notes/prometheus-2.0-2a7b3bc4ad76e118.yaml
@@ -0,0 +1,45 @@
+---
+summary: >
+  Updated the StackLight components to newer versions
+
+upgrade:
+  - |
+    Updated the following StackLight components:
+
+    - Prometheus server to version 2.0.0
+    - Alertmanager to version 0.11.0
+    - Pushgateway to version 0.4.0
+
+    .. important::
+
+       The new version of Prometheus is not backward compatible
+       with previous versions. Therefore, you must upgrade the
+       monitoring stack as described in the MCP Operations Guide.
+
+       If You want to stick to 1.7 (NOT RECOMMENDATED), update
+       reclass model:
+
+      .. code-block:: yaml
+
+         _param:
+           docker_image_alertmanager: docker-prod-virtual.docker.mirantis.net/openstack-docker/alertmanager:20171222124606
+           docker_image_pushgateway: docker-prod-virtual.docker.mirantis.net/openstack-docker/pushgateway:20171222124606
+           docker_image_prometheus: docker-prod-virtual.docker.mirantis.net/openstack-docker/prometheus:20171222124606
+           docker_image_remote_storage_adapter: docker-prod-virtual.docker.mirantis.net/openstack-docker/remote_storage_adapter:20171222124606
+         docker:
+           client:
+             stack:
+               monitoring:
+                 service:
+                   server:
+                     environment:
+                       PROMETHEUS_STORAGE_LOCAL_ENGINE: persisted
+                       PROMETHEUS_STORAGE_LOCAL_TARGET_HEAP_SIZE: 3221225472
+                       PROMETHEUS_STORAGE_LOCAL_NUM_FINGERPRINT_MUTEXES: 4096
+
+         prometheus:
+           server:
+             version: 1.7
+
+
+    .. TODO: Add a link to the upgrade procedure.