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I was able to find only 3 short mentions:
They are not very helpful. Compare this to how race detector (article, blog post) or pprof (blog post) is documented. People on Reddit even think that trace tool flopped.
If it helps, I did write this long time ago: https://github.com/campoy/go-tooling-workshop/blob/master/3-dynamic-analysis/4-tracing/1-tracing.md