[manigandham]

Because tracing, metrics (and logs) are the 3 fundamentals of observability and having a single standard API and library would allow everyone to move on from implementing the same thing all these years.

There are 0 advantages offered by opentracing and openmetrics over opencensus to defend having separate projects.

[sciurus]

OpenTracing began in 2015. It was accepted as a CNCF project in 2016.

OpenCensus began in 2018.

Don't get me wrong, it's better for Google and Microsoft to collaborate on OpenCensus instead of continuing to develop separate client libraries for Stackdriver and Application Insights. It would be lovely if AWS joined too.

I just want to point out that there was a lot of community effort and vendor adoption around OpenTracing by 2018 that Google chose to ignore. If you want to reduce fragmentation and reimplementation, criticize that decision, not the existence of OpenTracing.

[manigandham]

Users don't care what came first. OpenCensus created a better model by combining tracing and metrics and building libraries.