@Override
  public void persistAll(Connection connection) {
    if (!isOnlineLogProviderEnabled) {
      return;
    }
    if (slowLogPersistentService != null) {
      slowLogPersistentService.addAllLogsToSysTable(connection);
    }
  }
Add all slowLog events to system table. This is only for slowLog event's persistence on system
table.
hbase-server/src/main/java/org/apache/hadoop/hbase/namequeues/impl/SlowLogQueueService.java