@Deprecated(forRemoval = true)
    public String getLoggerName() {
        return config.getString(APIMAN_MANAGER_CONFIG_LOGGER);
    }
'Simple', 'JSON' or FQDN with {@link IApimanLogger} implementation.

@deprecated set the system property <code>apiman.logger-delegate=name`</code> instead (e.g. log4j2).
@see ApimanLoggerFactory Names are defined in <code>@ApimanLoggerFactory</code> annotations.
@return Logger name or FQDN
manager/api/core/src/main/java/io/apiman/manager/api/core/config/ApiManagerConfig.java