public LogWriterBuilder requestLogLevel(LogLevel requestLogLevel) {
        requireNonNull(requestLogLevel, "requestLogLevel");
        return requestLogLevelMapper(RequestLogLevelMapper.of(requestLogLevel));
    }
Sets the {@link LogLevel} to use when logging requests. If unset, will use {@link LogLevel#DEBUG}.
core/src/main/java/com/linecorp/armeria/common/logging/LogWriterBuilder.java