Why the heck can I find hardly any documentation on firing manual events from automations?

I’m trying to figure out how to properly fire an event and send data along with it from an automation. Either I am blind or there is almost no documentation on that feature. Where can I find it?

All I want is to append a state value from a “number” helper to the event data.

Thank you

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Wonder why google does not find it. I think since it is possible to do this from a script as well as from an automation, the documentation should become a more distinctive place.

Thank you.

Automation actions are just triggered script sequences. Thus the syntax is the same and only documented in one place.

It was the second search result for this search: https://www.google.com/search?q=home+assistant+custom+event