Thank you Jay! I’ve added that to the tracking URL, and it appears to have stopped adding to the crawler count.
I forgot to mention that prior to this I’ve had Uptime Robot in place for a long time, just tracking the base URL.
Interestingly, YTD Discourse has reported just 1 hit from Mozilla/5.0+(compatible; UptimeRobot/2.0; http://www.uptimerobot.com/).
I wonder if some uptime crawlers are automatically excluded from reporting..? 