I tried to find one. The closest I came is their Traffic dashboard [1], which is updated daily. I also checked their Twitter account [2] but no mention of problems yet.

[1]: https://duckduckgo.com/traffic [2]: https://twitter.com/duckduckgo

I looked at status.duck.com or status.ddg.com and both timed out so if they do, it's not there.

Ironically, the best way to find it would be to use a search engine.