sn_atf.custom_ui.mugshot_version

ServiceNow property description:

Please do not update without consulting the Automated Test Framework team first. Current version of mugshots and snapshots for ATF Custom UI testing, used to maintain backwards compatibility with existing Custom UI tests. Format should be "x.y" where "x" is the release number and "y" is the patch number of the most recent fix (it does not need to be updated with each version, only as needed).