Remove the rails_request_apdex_counters feature flag
What does this MR do and why?
This feature flag was enabled a few weeks ago in gitlab-com/gl-infra/scalability#1099 (comment 691402473) so it can now be removed.
The metrics that will now be available, this also documents these.
MR acceptance checklist
This checklist encourages us to confirm any changes have been analyzed to reduce risks in quality, performance, reliability, security, and maintainability.
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I have evaluated the MR acceptance checklist for this MR.
Edited by Bob Van Landuyt