Add execution_interval to the Mistral manifest

Related-Bug: #1747386
Depends-On: I9060253bc416be28af4ef81f3edf694059d92066
Change-Id: I6445ff1b6691a098f15e8402ae9d971e751f5552

manifests/cron_trigger.pp

@@ -11,15 +11,28 @@
 #   (boolean value)
 #   Defaults to $::os_service_default.
 #
+# [*execution_interval*]
+#   (Optional) This setting defines how frequently Mistral checks for cron
+#   triggers that need execution. By default this is every second
+#   which can lead to high system load. Increasing the number will
+#   reduce the load but also limit the minimum freqency. For
+#   example, a cron trigger can be configured to run every second
+#   but if the execution_interval is set to 60, it will only run
+#   once per minute.
+#   (integer value)
+#   Defaults to $::os_service_default.
+#
 #
 class mistral::cron_trigger (
   $enabled            = $::os_service_default,
+  $execution_interval = $::os_service_default,
 ) {
 
   include ::mistral::deps
   include ::mistral::params
 
   mistral_config {
-    'cron_trigger/enabled':        value => $enabled;
+    'cron_trigger/enabled':             value => $enabled;
+    'cron_trigger/execution_interval':  value => $execution_interval;
   }
 }

releasenotes/notes/add-cron-trigger-interval-94df2eb3506cb7cb.yaml

@@ -0,0 +1,3 @@
+---
+features:
+  - Add the execution_interval parameter to the cron trigger manifest.

spec/classes/mistral_cron_trigger_spec.rb

@@ -5,16 +5,19 @@ describe 'mistral::cron_trigger' do
   shared_examples_for 'mistral cron trigger' do
     it 'configure cron trigger default params' do
       is_expected.to contain_mistral_config('cron_trigger/enabled').with_value('<SERVICE DEFAULT>')
+      is_expected.to contain_mistral_config('cron_trigger/execution_interval').with_value('<SERVICE DEFAULT>')
     end
 
     context 'with specific parameters' do
       let :params do
         { :enabled => true,
+          :execution_interval => 60,
         }
       end
 
       it 'configure cron trigger params' do
         is_expected.to contain_mistral_config('cron_trigger/enabled').with_value(true)
+        is_expected.to contain_mistral_config('cron_trigger/execution_interval').with_value(60)
       end
     end
   end