Multi-layer PostGIS MVT
There are lots of great enterprise infrastructure monitoring tools out there, like Nagios. And if you want to monitor a web page in minutia (i.e. detecting if a single pixel has changed), there’s stuff like Puppeteer.
But sometimes a web server just did something weird, and you want to keep an eye on it for a little while. I do that with a bash script.
It’s 2021, and this is the year I’m finally dropping Internet Explorer support. It’s down to < 2.5% of my users, and you can make a compelling argument pushing people off of IE11 is a humanitarian gesture.