It has just been one IP address.Depends on how many different IP addresses the "bots" are coming as.
Here was the forum software owner's reply:
This IP address identifies itself as AwarioBot, which we have blocked in robots.txt but of course it doesn't listen. They claim it is harmless.
While I can't provide you the access logs for privacy policy reasons, I see no evidence that it's looking for vulnerabilities. This IP address is simply scanning pages. It does not have any patterns that we see when vulnerabilities are attempted to be exploited.
We see a lot of crawlers that are hosted on the Hetzner network and we actually have numerous blocks of Hetzner's datacenter banned for excessive crawling and/or exploitation attempts so this comes as no surprise.
I hope this gives you some insight as to what it is.