[vmarchaud]

I've used OpenTelemetry since it's original alpha in 2020. Originally the main issue i had was supporting tracing across common libraries (there wasn't a lot of libraries supported back then). Now (and i recently worked with it) i would say is which protocol is supported by which component: your sdk generate spans/metrics in a specific format, then you send that to a collector that accept a range of protocol versions and finally you can send that to your vendor ... but you need to know which protocol/version it supports.

That's not actually something you can do much about considering the sheer size of opentelemetry (both in term of implementation and vendors working on it) and i expect for people implementing nowadays, proto should be pretty stable and my experience should theorically not be the case anymore.