A replacement is now accepted only if it makes the mempool better for miners once every linked transaction is taken into account, replacing piecemeal rules that could produce inconsistent results. The release also raised the default database cache on machines with enough memory.
All events
Bitcoin Core 31.0 ships cluster mempool
The release reorganised how nodes track unconfirmed transactions, judging replacements across whole clusters of related transactions.
▶Ride to this stop
IN THE SHOWThe Fork Wars