[v24.2.x] Add rate-rejected connection metric #22816
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Adjust the existing metric text to clarify that is connections rejected for hitting the connection count cap, not the connection rate limit cap (as we are shortly introducing a metric for the latter). Ref CORE-6827. (cherry picked from commit daf4917)
We can reject connections because we hit two types of limits: the open connection limit or the rate limit (in the rate limit case we do try to wait a short period to see if accepting the connection after the wait would meet the rate, but if not we reject). Existing naming of variables, log lines etc was inconsistent using "declined" for the second case and generally not being clear about the two cases. Bring this into line by using "rejected" as the standard terminology and then "open limit" and "rate limit" being the two reasons. Log the addr in the same way too, including the port, in either case. (cherry picked from commit e55a2be)
Add connections_rejected_rate_limit which counts connections rejected due to the rate limit, analogously to the existing metric which counts rejected connections due to the hitting the open connection limit. Fixes CORE-6827. (cherry picked from commit b1f3372)
piyushredpanda
approved these changes
Aug 10, 2024
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Backport of PR #22803