I'm More Surprised
That it didn't happen sooner. PagerDuty is a great big bullseye.
I mean, they've got access to the pager messages of all manner of businesses. Whether collected in transit or after the fact, some of that stuff surely has to be very valuable to somebody somewhere for gaining entry or espionage. I can't imagine that many sites will have thought about obscuring sensitive information in pager messages, just in case PagerDuty were busted.