Update protocol defined for internal collection

[mjuarez]

Per open-telemetry/opentelemetry-collector#12332, a breaking change for the protocol used was introduced

[chalin]

LGTM. Awaiting final approval of @open-telemetry/collector-approvers.

[tiffany76]

Thanks for staying on top of the changes, @mjuarez! I see that the changelog update isn't quite merged yet, so let's ask the @open-telemetry/collector-approvers to take a look.

One additional question. Do we need to add a comment about versions? Something like, "if you're using Collector v0.118.0 or older, grpc/protobuf or grpc can be used. From v0.119.0, grpc/protobuf is no longer valid." I don't know if this is useful or relevant information to users but figured I'd ask.

[mjuarez]

I know the changelog update isn't in, but had a peer on my team reference the existing doc while using the latest published version (0.119.0) and it was broken for them. So anyone new to otel-collector wouldn't be set up for success.

I'm unsure about distinguishing config options by version. Has that been used elsewhere in the docs I can use as an example? Happy to update.

[tiffany76]

I think we can skip the versioning comment, since as you point out @mjuarez, this is a configuration change.

With apologies for delaying this PR a bit longer.... As I was looking through the internal telemetry page, I saw that grpc/protobuf is used again further down, on line 172. Does it need to be updated there as well, @mx-psi?

[mx-psi]

Ah, good catch, yes! This needs to be removed as well

[tiffany76]

@mjuarez, if you could remove the /protobuf from line 172 as well, I think we can call this one done!