Manual:$wgTagStatisticsNewTable

MediaWiki settings: $wgTagStatisticsNewTable
Temporarily flag to use change_tag_def table as backend of change tag statistics.
Introduced in version:	1.32.0
Removed in version:	1.33.0
Allowed values:	(boolean)
Default value:	false
Other settings: Alphabetical | By function

For example in case of Special:Tags. If set to false, it will use change_tag table. Before setting it to true set $wgChangeTagsSchemaMigrationStage to MIGRATION_WRITE_BOTH and run PopulateChangeTagDef maintaince script. It's redundant when Manual:$wgChangeTagsSchemaMigrationStage is set to MIGRATION_NEW.