logging-log4j2
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Allow old plugins to work with 3.x
The changes in 3.x broke some old 2.x external plugins like log4j2-logstash-layout (cf. #1586).
We should consider maintaining binary compatibility in some util classes (e.g. Constants) to allow most 2.x plugins to work with 3.x without any changes.
How can we fix the incompatibility with the changes in Layout, though? If we release Log4j 3.0 with support for serialization, that'll be embarrassing to be honest.