Defined in carb/logging/Log.h

const int32_t carb::logging::kLevelWarn = 0

Warning level, this is for warning messages.

Something could be wrong but not necessarily an error. Therefore anything that could be a problem but cannot be determined to be an error should fall into this category. This is the default log level threshold, if nothing else was specified via configuration or startup arguments. This is also the reason why it has a value of 0 (default as zero).