In theory this (Weinmann) rim has a "safety line": https://www.weinmanntek.com/technology/6/6

However, there's no obvious line that I can see, so maybe there's a tiny bit of life left in this. But it's not really worth the risk, as this is a front wheel (dynamo hub) and so rim failure would be catastrophic.

edit: also, I hate that this has a line that's supposed to appear when it's worn, rather than a line or dot that disappears when worn. And kudos to everyone ignoring my dumb pun in the OT. Don't encourage me!