public boolean containsBuiltIn(BuiltInProperty property) {
        requireNonNull(property, "property");
        if (builtInProperties == null) {
            return false;
        }
        return builtInProperties.contains(property);
    }
Returns {@code true} if the specified {@link BuiltInProperty} is in the export list.
core/src/main/java/com/linecorp/armeria/common/logging/RequestContextExporter.java