public boolean unsubscribe(final long subscriberId) {
    return subscribers.remove(subscriberId) != null;
  }
Remove a subscriber from the list.

@param subscriberId the ID of the subscriber to remove
@return <code>true</code> if a subscriber with that ID was found and removed, otherwise <code>
         false</code>
util/src/main/java/org/hyperledger/besu/util/Subscribers.java