Add a collector for /proc/key-users #2786
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This collects usage information (per-user) on the Linux kernel keyring
See: https://man7.org/linux/man-pages/man7/keyrings.7.html
It is disabled by default because cardinality is one per-user.
I was going to do a custom scrape for this but I think it fits in the broader /proc scrape world and may be useful.
@SuperQ @discordianfish