@Override
  public void toStringClassDetails(StringBuilder sb) {
    sb.append(getClass().getSimpleName());
    sb.append(" server=");
    sb.append(serverName);
    sb.append(", rpcThrottleEnabled=");
    sb.append(rpcThrottleEnabled);
  }
The procedure to switch rpc throttle
hbase-server/src/main/java/org/apache/hadoop/hbase/master/procedure/SwitchRpcThrottleProcedure.java