services/horizon/internal/httpx: Add prometheus metrics for requests in flight and requests received #5240
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PR Checklist
PR Structure
otherwise).
services/friendbot, orallordocif the changes are broad or impact manypackages.
Thoroughness
.mdfiles, etc... affected by this change). Take a look in the
docsfolder for a given service,like this one.
Release planning
needed with deprecations, added features, breaking changes, and DB schema changes.
semver, or if it's mainly a patch change. The PR is targeted at the next
release branch if it's not a patch change.
What
Add prometheus metrics for requests in flight and requests received.
Why
We already have metrics for requests served but we don't have any metrics for requests received or requests in flight. Having these metrics will allow us to detect cases where there are a large amount of requests building up in horizon. This would also be helpful in debugging cases where there is a spike in TCP connections.
Known limitations
[N/A]