GitLab

While pushing a new branch to git-rw I received:

remote: Resolving deltas: 100% (2093/2093), completed with 683 local objects.
remote: Checking connectivity: 3049, done.
remote: via /srv/git.torproject.org/git-helpers/post-receive-diff
remote: == 00-sync-to-mirror == 
remote: == commit-mail == 
remote: [hooks/post-receive] Warning: creation or deletion of branches not supported
remote: == github-push == 
remote: == gitlab-push == 
remote: == irc-message == 
remote: == per-repo-hook == 
remote: == xx-jenkins-trigger ==
remote: [hook[9828]] Triggering jenkins build for (https://git.torproject.org/tor-browser.git, tor-browser-68.8.0esr-9.5-1, 2394f6fb251e34668c302191a8bdebf8e487775b).
remote: No git jobs using repository: https://git.torproject.org/tor-browser.git and branches: tor-browser-68.8.0esr-9.5-1
remote: No Git consumers using SCM API plugin for: https://git.torproject.org/tor-browser.git
remote: [hook[9828]] Jenkins triggers done.
remote: error: The last gc run reported the following. Please correct the root cause
remote: and remove gc.log.
remote: Automatic cleanup will not be performed until the file is removed.
remote: 
remote: warning: There are too many unreachable loose objects; run 'git prune' to remove them.
remote:

error was colored red, and warning was colored yellow, so this seems mildly important?