What are the numbers in the square brackets in NSLog() output?

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半阙折子戏
半阙折子戏 2020-12-03 05:16

What is the stuff between the [] in the log message below? I get this in my iPhone app, and I have no idea where the message is coming from. My first guess woul

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  •  甜味超标
    2020-12-03 06:07

    It's a process ID in fact. You can see that in the GDB console with a line somewhere that should read "[Switching to process 376]".

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