In automations i use Telegraph and log entries to know what happened. But instead of a fixed message (i.e. Pool stopped) i would like to add the actual criteria, i.e. battery volt or battery soc.
How can one insert into the message text the value of a variable (sensor) ??
I believe the only built-in card type that you can use templates in are Markdown cards. Some custom cards also accept Jinja templating, and some use other forms like Javascript.