@necubi I do not disagree with you about the value of tail-based sampling. It has been an item on Jaeger roadmap from day one, but never of high enough priority to implement it. We're planning to do a POC by the end of this year. Jaeger's agent-based architecture was specifically designed to support that use case. If you're interested in collaborating on that, it would be great (https://github.com/uber/jaeger/issues/425).

Having said that, Dapper-style tracing systems with head-based sampling still provide enormous benefits that are often underestimated. In fact, even if we support tail-based sampling in the future, we're still going to run a certain portion of the traffic through probabilistic, head-based sampling, because it allows to reason about statistical patterns observed in the systems at large scale.

Thanks, please do. :)

100% agree with what necubi said. I work at LightStep and it's great to see OSS implementations coming out. The creators of LightStep actually are also the creators of Dapper haha.

LightStep specifically is meant for large-scale enterprise deployments and their specific needs and has focused on that for now.