Optional Readonly atBuffer limit. I.e. the maximum number of log messages to store in buffer.
The values less that 1 are treated as 1.
1024
Optional onThis is called whenever a log message is about to be buffered.
It may drop either the new message, or some of already buffered ones.
If the buffer is full (i.e. its fill ratio is 1), and this method did not
drop any of the messages, then the oldest message will be dropped.
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A specification of how to buffer log messages.