MediaWiki:Apihelp-flagconfig-extended-description

The following parameters are returned for each tag: Flagged revisions have an assigned level for each tag. The highest tier that all the tags meet is the review tier of the entire revision.
 * name:The key name of this tag.
 * levels:Number of levels the tag has (above 'not tagged').
 * tier2:Level the tag must reach for a revision to be tier 2 (quality).
 * tier3:Level the tag must reach for a revision to be tier 3 (pristine).