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Keep the lines at or under 70 characters to avoid display issues in GitHub, and <= 62 characters for the title / commit summary line. The ticket should be a valid Jira ticket and should be all caps (e.g., DAOS-1234). The component should be a valid DAOS component in lower-case. A script in DAOS ci will check the ticket based on the PR title and automatically pull information such as the status and priority. Valid components can be worked out by checking ci/jira_query.py in the DAOS source, but generally, any valid subdirectory of src or src/client will suffice (e.g. vos, object, api) or a specialized one such as build, ci, etc.
Should you get jira_query errors in your PR due to a malformed title, you may have to edit the PR title before a subsequent push to fix the issue. Valid components are defined as directories in src, src/client, or utils or explicitly defined in ci/jira_query.py as VALID_COMPONENTS.
Also refer to /wiki/spaces/CI/pages/1389759093 and Test Tags.