Thanks @MarkDoerr and @tobiaseigen
It seems to be starting to calm down, though considerably higher than before. Hopefully the trend will continue.
We have tried crawler slowdown when we were being spammed by Bing, but there is no indentifieable user agents for the new traffic. Also as a very international community we can’t geoblock.
I didn’t know it was possible to put Google Analytics, if this becomes a real problem we may need to consider this. Though it would involve thinking about community privacy first.
For now I’ll see if it continues to regress towards the mean.