Reduce 409 Conflicts in /api/v4/jobs/request
From #36154 (comment 248806448), we see we get about ~200 409 Conflict error messages a minute (https://log.gitlab.net/goto/c405ea773a259891b56ead4149f5f0f2):
This is bad because it ties up the API request because we have to obtain another build. We see the P99 for these requests reaches 2 s (https://log.gitlab.net/goto/c405ea773a259891b56ead4149f5f0f2):
Edited by Grzegorz Bizon