Add docker prometheus alerts

Change-Id: I1fb242c2423d6823b0302c906bd14b882702b811
diff --git a/docker/meta/prometheus.yml b/docker/meta/prometheus.yml
new file mode 100644
index 0000000..9ff54a4
--- /dev/null
+++ b/docker/meta/prometheus.yml
@@ -0,0 +1,13 @@
+server:
+  alert:
+    ProcstatRunningDockerd:
+      if: >-
+        procstat_running{process_name="dockerd"} == 0
+      {% raw %}
+      labels:
+        severity: warning
+        service: docker
+      annotations:
+        summary: 'Dockerd service is down'
+        description: 'Dockerd service is down on node {{ $labels.host }}'
+      {% endraw %}
diff --git a/metadata/service/support.yml b/metadata/service/support.yml
index a90412e..a1c25d8 100644
--- a/metadata/service/support.yml
+++ b/metadata/service/support.yml
@@ -13,3 +13,5 @@
         enabled: false
       sphinx:
         enabled: true
+      prometheus:
+        enabled: true