I have a 3 year old installation running on AWS where everything works. The repository is Mercurial hosted on Bitbucket.
However, after the first year, the Diffusion history (/diffusion/D/history/) failed to update and shows a now two-year old commit on top. Though /diffusion/ does get updated and shows the latest commit and commit count.
I've updated Phabricator every few months including just now (to 5295c6ba1e6176fe39cb4f2882776e1f13841cb3).
What could be the issue?