Package: iproute2
Version: 6.1.0-3
The ss(8) man page reads:
-e, --extended
Show detailed socket information. The output format is:
uid:<uid_number> ino:<inode_number> sk:<cookie>
But judging by the source[*], there's also "fwmark:" and "cgroup:".
Please document them too.
[*] https://sources.debian.org/src/iproute2/6.13.0-1/misc/ss.c/#L1469 -- Jakub Wilk