propolis-server: collect and report VSS minus VM mappings#889

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iximeow wants to merge 7 commits intomasterfrom

ixi/memory-stats

Commits on Apr 30, 2025

with moderate levels of jank, patch Omicron sufficiently to use a real rev
iximeow
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avoid the TOCTOU of reading VSS with/without VM components
iximeow
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Commits on May 1, 2025

virtual memory size is typically written "VSZ" not "VSS"....
iximeow
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