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I have hundred of file like CrashpadMetrics.pma~xxx.TMP, some created from a year ago in the folder AppData\Local\Google\Chrome\User Data

There is also a main CrashpadMetrics-active.pma.

What are thoses files and why aren't they delete every now and then ?

Can I safetly delete all the old CrashpadMetrics.pma~xxx.TMP as there are taking lot of space.

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PMA files are for data collection- CrashpadMetrics-active.pma should not be removed manually. This thread provides most of the answers, e.g.

They are created if one activates "Automatically send usage statistics and crash reports to Google" in Settings.

And another:

The "live" (i.e. BrowserMetrics-identifier.pma) file has the data shown in chrome://histograms.

There is also a link to the source where the metrics are generated in the following functions:

    ExceptionEncountered
    CrashReportPending
    CrashReportSize
    CrashUploadAttempted
    CrashUploadSkipped
    ExceptionCaptureResult
    ExceptionCode
    ExceptionEncountered
    HandlerLifetimeMilestone
    HandlerCrashed

Note the stony silence on the questions regarding the existence of a PMA file viewer.
Think the tmp files are removed when Chrome is shutdown down gracefully, but if it aborts, they are ignored in future runs. According to WinApp2, they can be removed manually.

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    Thanks for your answer! Apparently, they are also created when the setting "Automatically send usage statistics and crash reports to Google" is set to disable...
    – MagTun
    May 17, 2019 at 14:00

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