The Mistral cron-trigger subsystem creates unnecessary load on the undercloud

[Dougal Matthews]

The Mistral cron-trigger subsystem queries the database by default every second. This creates additional load that isn't needed, TripleO only has cron triggers that run infrequently, every 30 minutes.

We should reduce the frequency of the cron triggers, meaning they can still be useful without adding constant load.

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/540805

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/540805
Committed: https://git.openstack.org/cgit/openstack/instack-undercloud/commit/?id=3e702f3bdfea21c69dc8184e690f26e142a13bff
Submitter: Zuul
Branch: master

commit 3e702f3bdfea21c69dc8184e690f26e142a13bff
Author: Dougal Matthews <email address hidden>
Date: Mon Feb 5 09:52:20 2018 +0000

    Increase the Mistral cron_trigger interval

    Reducing the frequency of the Mistral cron trigger subsystem greatly reduces
    the load that is has on the system. Previously it would query the
    database every second, now it will only do this every 10 minutes.

    Closes-Bug: #1747386
    Depends-On: I6445ff1b6691a098f15e8402ae9d971e751f5552
    Depends-On: I9060253bc416be28af4ef81f3edf694059d92066
    Change-Id: I18ae5bc0b2192a393959186ba756d1e6a6c62d83

[OpenStack Infra (hudson-openstack)]

This issue was fixed in the openstack/instack-undercloud 8.3.0 release.