I was having trouble keeping track of which of my house's three heating zones was activating the boiler and pump at any given time. So I built a device to monitor which zone was calling for heat.
Zone activation sensor system, with indicator lights
I used Prometheus to keep track of zone activation over time.
Two days of zone activation lots via Prometheus. The temperature dropped over the last 8 hours, so you can see the upper floor is constantly active.
I wrote a CircuitPython program to read the analog signals from the clamp sensors, then make that reading available to my prometheus server via a simple HTTP endpoint. Setting up CircuitPython took a bit of work, let me know in a comment if you would like a blog post about that process.