Steps for reproducing:
Started by user User
[Wed Jul 26 12:21:59 GMT 2017] Starting branch indexing...
Acquired master cache lock.
$ /usr/bin/hg clone --noupdate ssh://firstname.lastname@example.org/orgname/reponame /var/jenkins_home/hgcache/BC5CF33F611210F92F733E9440B2549700FC07D6-reponame
remote: Permission denied (publickey).
abort: no suitable response from remote hg!
ERROR: Failed to clone ssh://email@example.com/orgname/reponame
Master cache lock released.
ERROR: Could not use caches, not fetching branch heads
[Wed Jul 26 12:22:01 GMT 2017] Finished branch indexing. Indexing took 1.4 sec
Allow SCMSource and SCMNavigator subtypes to share common traits
Mercurial doesn't use credentials in Modern SCM for Shared Library