public void setExportGroup(ExportGroupConfig exportGroupConfiguration) {
        requireNonNull(exportGroupConfiguration, "exportGroupConfiguration");
        configureExporter(builder -> builder.exportGroup(exportGroupConfiguration.build()));
    }
Adds the export group.
Note: this method is meant to be used for XML configuration.
logback/logback12/src/main/java/com/linecorp/armeria/common/logback/RequestContextExportingAppender.java