What/who turned on light? Missing in logs

Configuration
1

I have a light that sometimes I finds on and I don’t know what/who turned it on.
In the log I can see some state changes with username or automation that triggered it, but some don’t have any info about the origin of the trigger. For example today at 9:18:47 this light turned on, but…who/what turned it on?

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How can I investigate this?
Thanks!

2

Typically (though not always, because Home Assistant’s logging is not 100% comprehensive) - in this situation it means the light was turned on, OUTSIDE of Home Assistant. Whether manually at a switch or whether something like Alexa, Google etc was asked to turn it on, or it could have been turned on in an app.

3

Thanks for the info, but in my case the light is connected to a ModBus relay controlled by Home Assistant (through Node Red). There are no buttons, other apps, Alexa or similar. It can be controlled only by HA…

4

Really would be nice if it was an external device that turned something on/off if logbook showed the IP of who sent the message. Might not help in the ModBus case, but would help in many others.

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5

I created an automation that sent a message with the user-friendly name