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There is also https://expediadotcom.github.io/haystack/, an Open Tracing-compliant distributed tracing system.

There is also the Haystack group at MIT CSAIL, which has done some interesting stuff over the years:

http://haystack.csail.mit.edu/

Thanks for your comment. You might be correct.

What people on the internet are recommending is as long as the brand names would not be confusing it would be fine. The term "confusing" seems to be the tricky part. A trademark attorney would probably clarify it for us.