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/alertmanager.yml b/docker/swarm/stack/monitoring/alertmanager.yml
new file mode 100644
index 0000000..662baf4
--- /dev/null
+++ b/docker/swarm/stack/monitoring/alertmanager.yml
@@ -0,0 +1,37 @@
+classes:
+- system.prometheus.alertmanager.container
+parameters:
+  docker:
+    client:
+      stack:
+        monitoring:
+          network:
+            monitoring:
+              driver: overlay
+              driver_opts:
+                encrypted: 1
+          service:
+            alertmanager:
+              networks:
+                - monitoring
+              deploy:
+                replicas: 2
+                labels:
+                  com.mirantis.monitoring: "alertmanager"
+                restart_policy:
+                  condition: any
+              labels:
+                com.mirantis.monitoring: "alertmanager"
+              image: ${_param:docker_image_alertmanager}
+              ports:
+                - 15011:${prometheus:alertmanager:bind:port}
+              volumes:
+                - ${prometheus:alertmanager:dir:config}:${_param:prometheus_alertmanager_config_directory}
+                - ${prometheus:alertmanager:dir:data}:${_param:prometheus_alertmanager_data_directory}
+              environment:
+                ALERTMANAGER_CONFIG_DIR: ${_param:prometheus_alertmanager_config_directory}
+                ALERTMANAGER_DATA_DIR: ${_param:prometheus_alertmanager_data_directory}
+                ALERTMANAGER_BIND_PORT: ${prometheus:alertmanager:bind:port}
+                ALERTMANAGER_BIND_ADDRESS: ${prometheus:alertmanager:bind:address}
+                ALERTMANAGER_DISCOVERY_DOMAIN: 'monitoring_alertmanager'
+                ALERTMANAGER_EXTERNAL_URL: "http://${_param:stacklight_monitor_address}:15011"