public void discardRoundsPriorTo(final ConsensusRoundIdentifier completedRoundIdentifier) {
    roundChangeCache.keySet().removeIf(k -> isAnEarlierRound(k, completedRoundIdentifier));
  }
Clears old rounds from storage that have been superseded by a given round

@param completedRoundIdentifier round identifier that has been identified as superseded
consensus/ibft/src/main/java/org/hyperledger/besu/consensus/ibft/statemachine/RoundChangeManager.java