Comment 3 for bug 1796639

As mentioned in the review, this is not related to that patch as it's failing to list the stacks in undercloud heat.

However from the heat api logs it's quite confusing.

It fails around 2018-10-08 01:12:42 and the corresponding heat api log

http://logs.openstack.org/24/567224/117/check/tripleo-ci-centos-7-undercloud-upgrades/e4ad94e/logs/undercloud/var/log/heat/heat_api.log.txt.gz#_2018-10-08_01_12_42_343

However, then it seems heat-api is restarted and it seems to work fine in a later time.

http://logs.openstack.org/24/567224/117/check/tripleo-ci-centos-7-undercloud-upgrades/e4ad94e/logs/undercloud/var/log/heat/heat_api.log.txt.gz#_2018-10-08_01_15_04_869