Split monitoring stack to dedicated services

In order to introducing prometheus long term storage
we need to have an ability to arrange monitoring docker
services in a more flexible way. Ie be able to enable
or disable particular service.

Docker stack and prometheus target DNS branches are affected.

Change-Id: I0310c716bd39f780ae0080032cad4a2278132bcb
Partial-fix: PROD-17350
diff --git a/docker/swarm/stack/monitoring/pushgateway.yml b/docker/swarm/stack/monitoring/pushgateway.yml
new file mode 100644
index 0000000..af108a6
--- /dev/null
+++ b/docker/swarm/stack/monitoring/pushgateway.yml
@@ -0,0 +1,30 @@
+classes:
+- system.prometheus.pushgateway.container
+parameters:
+  docker:
+    client:
+      stack:
+        monitoring:
+          network:
+            monitoring:
+              driver: overlay
+              driver_opts:
+                encrypted: 1
+          service:
+            pushgateway:
+              networks:
+                - monitoring
+              deploy:
+                replicas: 2
+                labels:
+                  com.mirantis.monitoring: "pushgateway"
+                restart_policy:
+                  condition: any
+              environment:
+                PUSHGATEWAY_BIND_PORT: ${prometheus:pushgateway:bind:port}
+                PUSHGATEWAY_BIND_ADDRESS: ${prometheus:pushgateway:bind:address}
+              labels:
+                com.mirantis.monitoring: "pushgateway"
+              image: ${_param:docker_image_pushgateway}
+              ports:
+                - 15012:${prometheus:pushgateway:bind:port}