corehttp/metrics.go: ERROR with more than one RPC API listener

[lidel]

Version

0.17.0-rc1

Config

> ipfs config --json Addresses.API                                                                                                      
[
  "/ip4/127.0.0.1/tcp/5001",
  "/ip6/::1/tcp/5001"
]

Description

Daemon is ready
2022-11-10T22:46:26.286Z	ERROR	core/server	corehttp/metrics.go:64	OC default registry ERROR	{"error": "cannot register the collector: duplicate metrics collector registration attempted"}

A potential fix would be to detect that metrics are already registered, and reuse the existing instance.

[forgondolin]

Also happening on 0.18