Last Mercurial version supported
In RedmineRepositories the Mercurial versions supported are from 1.2 to 4.3.1.
We upgraded Redmine from 3.4.4 to 4.0.4 (centos 6.9 with Mercurial 1.4) and got this error:
hg --config extensions.redminehelper=redminehelper.py rhsummary *** failed to import extension redminehelper from redminehelper.py: 'module' object has no attribute 'command' hg: unknown command 'rhsummary' Mercurial Distributed SCM
We upgraded Mercurial from 1.4 to 4.0 and the problem was solved.
I would update the wiki myself, but I don't know which is the minimum version supported.