Adding SLI error rates to the rack middleware
What does this MR do and why?
This change increments SLI error rates, using the GitLab metrics library, given the HTTP requests are erroring.
A feature flag will be used to roll it out disabled by default: #383071 (closed)
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How to set up and validate locally
Numbered steps to set up and validate the change are strongly suggested.
MR acceptance checklist
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Edited by Hercules Merscher