One client (astral) writes it's…

One client (astral) writes it's name in the tags of events, others don't. Some clients use specific 'Origin' http headers, so relays they connect to could see that, but a stat from one relay isn't that helpful.

I thought I could apply some heuristics which client created a profile (kind:0), because they mostly differ slightly from each other. But then users may switch clients, and bots could create accs resembling some client... So didn't go that route.

No other ways to measure that, I think.