It has happened a number of times recently (
MDLSITE-5248...) that our git server (gitlab) has been down.
Right now that makes the prechecker to fail, and to report problems in the tracker. Final user should not receive this.
Instead, if sending the branch to git.in.moodle.com fails...
1) precheck should continue (it all happens in the CI server).
2) integrators should be notified to verify if there is any problem with git.