[monitoring] Add and expose opentelemetry metrics#1454
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LGTM modulo minor comments
mickmis
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This PR add metrics in already existing telemetry base, with expose via a prometheus compatible endpoint.
This don't include specifc metric, but there are already informatives ones with out-of-the-box feature of
otelhttpandotelpgx.Both of existing one have been enriched: name has been added to otelhttp, and stats recording have been added to
otelpgx.Documentation / infra changes & correct dashboard will come in future PRs.
Contrib to #1257
Quick-llm-generated dashboard to have a glance at existing metrics: