If the logger was constructed without a log level, all initial
messages are stored in a buffer, and processed at a later time,
when the log level is set.
Each record in the buffer stores the message, the log level and
a function to process the message.
Type of a record stored in the internal buffer.
If the logger was constructed without a log level, all initial messages are stored in a buffer, and processed at a later time, when the log level is set.
Each record in the buffer stores the message, the log level and a function to process the message.