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Without this change, logging (even if unused) may account for a substantial portion of bitcoin-node's and/or client's runtime cpu usage, due to libmultiprocess's expensive message serialization. This (along with some recent upstream changes) avoids the overhead by opting out of log handling for messages that we're not interested in. Info, Warning, and Error are logged unconditionally to match our behavior elsewhere. See BCLog::Logger::GetCategoryLogLevel .