fix: serve metrics correctly when there are multiple listeners #10489
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When there are multiple listeners configured for Addresses.API, serving metrics results in an errors: " was collected before with the same name and label values".
This PR fixes this by maintaining a global map of metrics handlers, and only creating and reginstering them once. The same metrics handlers are provided to the mux for every listener.
Fixes #9891
Fixes #9397
Unblocks #9637