public ConnectorStateInfo connectorStatus(SourceAndTarget sourceAndTarget, String connector) {
        checkHerder(sourceAndTarget);
        return herders.get(sourceAndTarget).connectorStatus(connector);
    }
@param config    MM2 configuration from mm2.properties file
@param clusters  target clusters for this node. These must match cluster
                 aliases as defined in the config. If null or empty list,
                 uses all clusters in the config.
@param time      time source
connect/mirror/src/main/java/org/apache/kafka/connect/mirror/MirrorMaker.java