private Optional<Long> remoteHashesPerSecond() {
    return Optional.of(sealerHashRate.asMap().values().stream().mapToLong(Long::longValue).sum());
  }
Responsible for determining when a block mining operation should be started/stopped, then
creating an appropriate miner and starting it running in a thread.
ethereum/blockcreation/src/main/java/org/hyperledger/besu/ethereum/blockcreation/PoWMiningCoordinator.java