ase in size for the utxo index (not discounting op_return and similar)
}

Examples:
> bitcoin-cli getblockstats '"00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09"' '["minfeerate","avgfeerate"]'
> bitcoin-cli getblockstats 1000 '["minfeerate","avgfeerate"]'
> curl --user myusername --data-binary '{"jsonrpc": "1.0", "id": "curltest", "method": "getblockstats", "params": ["00000000c937983704a73af28acdec37b049d214adbda81d7e2a3dd146f6ed09", ["minfeerate","avgfeerate"]]}' -H 'content-type: text/p