Phew. That was more of a pain than I expected. It just goes to show my mantra, the longer between upgrades the harder the upgrade will be.
Note to self: When using Ansible and Docker to deploys stuff, make sure to actually pull the latest image during the upgrades. Simply restarting the container won’t do anything for you. It looks like I’ve not upgraded my PostgreSQL for three years now.
But, now I can generate those screen shots. 
This is part of my overview dashboard. It’s useful when I need to debug stuff but most of the time I just let it email me with problems.
fenrir is my Synology NAS. charybdis is my opnSense firewall running FreeBSD. The rest (off screen) are various Linux machined and VMs.
Now that I have 6 working I need to look so see what’s changed and what’s new and use what’s helpful.
For me the most useful warnings are when swap gets low, machine no longer responds to ping (or ping is slow) and the systemd service monitoring.