From the description at T259: Bugzilla to Maniphest import script (tracking):
Investigate if personal tags can be turned into Phabricator "flags" but lowest priority. If not, I could warn users via email that their Tags data will get lost and that they should save buglist.cgi or such.
Save your Wikimedia Bugzilla personal Tags
we are contacting you because you have used Wikimedia Bugzilla's "Tags" functionality.
Wikimedia will soon migrate from Bugzilla to Phabricator. While most Bugzilla data will be converted, Phabricator does not offer any functionality similar to Bugzilla's personal "Tags". Hence your data in "Tags" will get lost soon.
You can find all Wikimedia Bugzilla tickets that you have tagged by visiting this URL:
Learn more about the Bugzilla migration to Phabricator at
Questions? Just ask at https://www.mediawiki.org/wiki/Talk:Phabricator/Help
Andre Klapper (Wikimedia Bugwrangler)