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Resource saturation: web/workers saturation

Web service is regularly running our of unicorn workers, leading to high queue times, elevated latencies and 503s.

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My best guess is that this is related to the Projects::MergeRequests::ContentController endpoint, specifically its usage on GitLab.com.

The following graph shows how usage of Projects::MergeRequests::ContentController has escalated since the beginning of October.

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Related https://gitlab.com/gitlab-com/gl-infra/infrastructure/issues/8407

cc @reprazent @m_gill