Blocking direct traffic spam - Unknown OS / Browser

Hi, we’re getting a lot of direct traffic spam. In CF Analytics I can see most of it shows as Unknown OS and Browser, although I presume this traffic also includes CF Health Checks and other Uptime monitoring solutions we have active.

My question is - how can I set up a firewall rule to block/challenge traffic with OS=Unknown and Browser=Unknown?

Have you looked at similar posts?

https://community.cloudflare.com/search?q=unknown%20os%20browser

Hi, yes checked them now, but no solutions. Am I to assume this can’t be done? Any other suggestions on how to block that traffic?

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