feat(metrics): add response_size, request_duration histograms #3748
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Overview
This change adds additional handler metrics
response_size_bytes
andrequest_duration_seconds
.It replaces the dependency for
felixge/httpsnoop
with functions from prometheus/client_golangWhat this PR does / why we need it
Closes #3698
Special notes for your reviewer
I have used default buckets for the histograms. I will try over the next week to get a custom build into my own QA landscape, in order to validate the buckets.