knowledge: record k3s versions across node classes

knowledge/software/metis.md

@@ -53,3 +53,21 @@
 - titan-21: Ubuntu 20.04.6 LTS, kernel 5.10.104-tegra, CRI containerd://2.0.5-k3s2, arch arm64
 - titan-22: Debian 13 (trixie), kernel 6.12.41+deb13-amd64, CRI containerd://2.0.5-k3s2, arch amd64
 - titan-24: Debian 13 (trixie), kernel 6.12.57+deb13-amd64, CRI containerd://2.0.5-k3s2, arch amd64
+
+
+### External hosts
+- titan-db: Ubuntu 24.10, kernel 6.11.0-1015-raspi, root on /dev/sda2 ext4 (465G), boot vfat /dev/sda1; PostgreSQL service enabled.
+- titan-jh: Arch Linux ARM (rolling), kernel 6.18.4-2-rpi, NVMe root ext4 238G (/), boot vfat 512M; ~495 packages installed (pacman -Q).
+- titan-23/oceanus: TODO audit (future).
+
+
+### Control plane Pis (titan-0a/0b/0c)
+- Ubuntu 24.04.1 LTS, kernel 6.8.0-1038-raspi, containerd 2.0.5-k3s2.
+- Storage: 477G SSD root (/dev/sda2 ext4), /boot/firmware vfat (/dev/sda1). fstab uses LABEL=writable and LABEL=system-boot.
+- k3s server (control-plane taint expected); etcd snapshots not yet cataloged (TODO).
+
+
+## k3s versions
+- rpi5 workers/control-plane: k3s v1.33.3+k3s1 (crictl v1.31.0-k3s2)
+- rpi4 nodes: k3s v1.31.5+k3s1 (crictl v1.31.0-k3s2)
+- Jetson titan-20/21: k3s v1.33.3+k3s1 (per node info), crictl v1.31.0-k3s2