It was all in one repo on that team, yes. Offhand, it seems like linking all PRs in all repos back to the bug, and linking the bug to all of the disparate PRs

It was all in one repo on that team, yes. Offhand, it seems like linking all PRs in all repos back to the bug, and linking the bug to all of the disparate PRs might help. A version (possibly) of the "many PRs" problem that we sort of had was that it often took many PRs to close a bug. Our goal wasn't to minimize the number of PRs, and in fact we encouraged small PRs. Rather, the goal was to get engineers past the commit and PR to the underlying motivation and design.