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Hello!
This pull request is fix of #403
When toString methods of some objects are expensive, we should be able to disable calling them in logging by changing log level. But when we use string concatenation, they will be called independently of log level. So let's use formatted version of logging. I have changed all logging calls that I have found.
Fox example, it is very actual for protobuf classes, because toString methods of them are overrided to write down all fields.