public LogWriterBuilder responseLogLevelMapper(ResponseLogLevelMapper responseLogLevelMapper) {
        requireNonNull(responseLogLevelMapper, "responseLogLevelMapper");
        if (this.responseLogLevelMapper == null) {
            this.responseLogLevelMapper = responseLogLevelMapper;
        } else {
            this.responseLogLevelMapper = this.responseLogLevelMapper.orElse(responseLogLevelMapper);
        }
        return this;
    }
Sets the {@link ResponseLogLevelMapper} to use when mapping the log level of response logs.
core/src/main/java/com/linecorp/armeria/common/logging/LogWriterBuilder.java