Say I have two devices, both connected to HA:
- WiFi switch in my bedroom connected to a cheap humidifier
- Humidity and Temperature sensor in my bedroom
And say I want to see how long it took the humidity to go up after the humidifier turned on.
A graph showing humidity levels on top of the “when wifi switch was off and when it was on” ribbon chart would help me determine that at-a-glance
Currently, I can only see super-imposed graphs for sensors that share the same unit (e.g. ‘%’). Also, IIRC, climate entities do this out-of-the-box showing when the heater turned on + the temperature reading.