@SuppressWarnings("unchecked")
    // visible for testing
    Enumeration<org.apache.log4j.Logger> currentLoggers() {
        return LogManager.getCurrentLoggers();
    }
Retrieve all known loggers within a given namespace, creating an ancestor logger for that
namespace if one does not already exist
@param namespace the namespace that the loggers should fall under; may not be null
@return all loggers that fall under the given namespace; never null, and will always contain
at least one logger (the ancestor logger for the namespace)
connect/runtime/src/main/java/org/apache/kafka/connect/runtime/Loggers.java