On 20-03-2018 - the CI team discovered an issue on the job's cleanup which caused random failures on changes testing due to failure in docker cleanup. There is an open Jira on the issue:
https://ovirt-jira.atlassian.net/browse/OVIRT-1939 Below you can see the chart for this week's resolved issues but cause of failure:
Code = regression of working components/functionalities
Configurations = package related issues
Other = failed build artifacts
Infra = infrastructure/OST/Lago related issues
Below is a chart of resolved failures based on ovirt version