@Deprecated
    @Nullable
    protected final RequestLogLevelMapper requestLogLevelMapper() {
        if (logWriterBuilder != null) {
            return logWriterBuilder.requestLogLevelMapper();
        }
        return null;
    }
Returns the {@link RequestLogLevelMapper} to use when logging request logs.

@deprecated Deprecated for removal in the next major version.
core/src/main/java/com/linecorp/armeria/common/logging/LoggingDecoratorBuilder.java