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Filesystem 1K-blocks Used Avail Capacity Mounted on /dev/md0 422318 401292 12580 97% /

Thought as much, it looks like its by design

the root filesystem is ephemeral, it's automatically repopulated on boot and is always expected to look out-of-space. The one you need to pay attention to is /var .

@CTXMike - thank you for this Mike - Much appreciated !!!