Meta issue to collect more stats that could be added to -coinstatsindex, or derived on the fly.
Each potential metric contains some remarks (can be updated later to e.g. explain why it's not practical).
Block size
Currently bogosize is the only thing we track in the index.
Block weight
Witness commitment
Whether a block has a witness commitment. Requires parsing the coinbase transaction? Or do we already track this?
Input and output: count & total BTC
Currently we track on the net increase / decrease in inputs / outputs.
(Extra) Nonce
Coindays destroyed
See also discussion in https://github.com/bitcoin/bitcoin/pull/19792