Klapper: Good bye Bugzilla, welcome Phabricator.
On his blog, André Klapper describes Wikimedia's move from Bugzilla to Phabricator, which is described as an "open source software engineering platform". After ten years and 70,000+ bugs, there was a lot of data to migrate, which went well overall, though there were a few surprises along the way.
"We had to work around an unresolved upstream XML-RPC API bug in Bugzilla by applying a custom hack when exporting comments in a first step and removing the hack when exporting attachments (with binary data) in a second step. Though we did, it took us a while to realize that Bugzilla attachments imported into Phabricator were scrambled as the hack got still applied for unknown reasons (some caching?). Rebooting the Bugzilla server fixed the problem but we had to start from scratch with importing attachments." (Thanks to Paul Wise.)