Since the first RC on the 19th we have a flat line of system_hooks jobs enqueued that don't get flushed
Further investigation on which system hooks we have setup pointed at still having marketo-tools enabled, but the queue consumer being removed in https://gitlab.com/gitlab-org/gitlab-ce/merge_requests/11027/diffs#6d2b5f3d62e6006fd635066c290db147770e62df
We need to have a way of flushing these jobs so the queue goes down to 0, even if that means just dropping the jobs.