@Override
    public List<String> setWorkerLoggerLevel(String namespace, String desiredLevelStr) {
        Level level = Level.toLevel(desiredLevelStr.toUpperCase(Locale.ROOT), null);

        if (level == null) {
            log.warn("Ignoring request to set invalid level '{}' for namespace {}", desiredLevelStr, namespace);
            return Collections.emptyList();
        }

        return loggers.setLevel(namespace, level);
    }
Service external requests to alter or reset connector offsets.
@param connName the name of the connector whose offsets are to be modified
@param offsets the offsets to be written; this should be {@code null} for offsets reset requests
@param cb callback to invoke upon completion
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/AbstractHerder.java