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
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