API throttling blocking specific runners
I see that we rolled out new API throttling rules in the last few hours. A number of users have reported issues:
* https://gitlab.com/gitlab-com/support-forum/issues/2685
* https://gitlab.com/gitlab-org/gitlab-runner/issues/2871
* https://gitlab.com/gitlab-org/gitlab-ce/issues/21698#note_46730200
/cc: @northrup
issue