Add events and alarm history expiration period

Change-Id: I1af50764f3519a7f6db35de024ac0da95e20c156
Related-Prod: https://mirantis.jira.com/browse/PROD-21307
diff --git a/panko/server/single.yml b/panko/server/single.yml
new file mode 100644
index 0000000..497b21e
--- /dev/null
+++ b/panko/server/single.yml
@@ -0,0 +1,16 @@
+classes:
+- service.panko.server.single
+- system.apache.server.site.panko
+parameters:
+  _param:
+    # Keep events in database for 30 days
+    panko_event_time_to_live: 2592000
+  panko:
+    server:
+      role: ${_param:openstack_node_role}
+      event_time_to_live: ${_param:panko_event_time_to_live}
+      # Check for expired events every day at 2 AM
+      expirer:
+        cron:
+          minute: 0
+          hour: 2
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