With the release of Heimdall for Homey 2.0 a new functionality is added to the app: Writing to the Timeline.
You can decide which events should be written to the Timeline in the apps settings:
And you can even write anything you like by using the Send information to Timeline action card in your own flows.
The result will look like this:
There’s another functionality added to Heimdall 2.0: Check Last Communication. Read about it here.