public void setExports(String mdcKeys) {
        requireNonNull(mdcKeys, "mdcKeys");
        checkArgument(!mdcKeys.isEmpty(), "mdcKeys must not be empty");
        configureExporter(builder -> {
            KEY_SPLITTER.split(mdcKeys)
                        .forEach(mdcKey -> {
                            checkArgument(!mdcKey.isEmpty(), "comma-separated MDC key must not be empty");
                            builder.keyPattern(mdcKey);
                        });
        });
    }
Adds the properties represented by the specified comma-separated MDC keys to the export list.
Note: this method is meant to be used for XML configuration.
Use {@code add*()} methods instead.
logback/logback12/src/main/java/com/linecorp/armeria/common/logback/RequestContextExportingAppender.java