If you somehow missed it, one of the certificates used by Lets Encrypt chain of trust expired this week. As expected, things broke…. including my private, filtered DNS over TLS server - SkyHole. Below is a condensed form of my notes to create the exact document that I wish I had while trying to triage broken DNS on my phone. TL;DR: Implement solution 3 from this post. Note: After releasing the initial version of SkyHole, I re-factored most of the code to eliminate the dependency on Docker.

EDIT: (2021-09-19): After some back and forth with /u/Laxarus, there is now a simpler method! The snmp platform still does not support setting device_class, but wrapping the sensor in another template sensor is not required; just do so in your customize.yaml. I have called this out below. This is another quick “here’s how I did it, hope this help” post. In preparation for the inevitable grid brownouts that summer 2021 would bring, I installed a rather beefy UPS for my home network / lab.