What
A new internal function checks a list of memory stores together, applying the same threshold used elsewhere to detect when too many files appear to have been deleted from a single store, but now across the whole set of stores at once. It reports back the threshold used, how many files are missing, and how many targets remain on disk.
Why
This appears to be a safety check meant to catch large-scale accidental deletion spanning multiple memory stores, though it isn't confirmed where or when it is actually called.
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The writer flagged doubt
No confirmed caller for this function was found, so it's unclear when or whether it currently runs.