node: detect and fill counters as part of debug_api/metrics rpc #16054
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This PR addresses #15933
I am not 100% sure this is the correct way to fix the problem, but all counters are listed as type string and default value "Unknown metric type" when returned by this RPC.
I am not sure how this ever worked, considering that we have many counters as part of the codebase - @karalabe were they ever displayed in the
geth monitor
?