Yes, one LoggingEvent must be created. The title is "Construct message in LoggingEvent lazily".

I know about configuring log levels - I want something different. Let me repeat:
The idea for this configuration is to have several log files with different detalization. I think this is a valid usecase.

Anyway this is a possibility to optimize cases where log level allows logging of the event but some filter (e.g. ThresholdFilter) don't,

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