Add OTel-Arrow components to contribcol; mark these alpha

[jmacd]

Description: Labels the otelarrowexporter and otelarrowreceiver as alpha, adds them to the contribcol.

Link to tracking Issue: #26491

[crobert-1]

v0.103.0 is currently being released, so this will need to be updated once the release is complete.

Also, just in case it's not obvious, make sure to submit a PR to the releases repository to add these components to the contrib distribution, as described here.

[lquerel]

LGTM

[atoulme]

Yes, I'd wait for 0.103.0 to be out and then fix conflicts.

[jmacd]

Also, just in case it's not obvious, make sure to submit a PR to the releases repository to add these components to the contrib distribution, as described here.

@crobert-1 Asking for slight clarification: The internal/components code has no documentation -- the above text is the only reference to it -- and it appears to be auto-generated? Is it the same as cmd/otelcontribcol/components.go?

[jmacd]

@crobert-1 Also, who determines which distribution these components can go into? Speaking as the developer, we are hoping to recommend OTel-Arrow as a more-performant and 100% compatible replacement for the OTLP exporter and receiver. Therefore, I would recommend adding OTel-Arrow components to every distribution that has an OTLP exporter or receiver component.

[jmacd]

open-telemetry/opentelemetry-collector-releases#582 FYI

[codeboten]

Also, who determines which distribution these components can go into

The rules for inclusion are listed in each distribution's readme file listed at the bottom of the doc here: https://github.com/open-telemetry/opentelemetry-collector-releases

[crobert-1]

Also, just in case it's not obvious, make sure to submit a PR to the releases repository to add these components to the contrib distribution, as described here.

@crobert-1 Asking for slight clarification: The internal/components code has no documentation -- the above text is the only reference to it -- and it appears to be auto-generated? Is it the same as cmd/otelcontribcol/components.go?

Thanks for pointing that out, it looks like the internal/components documentation is out of date, I've submitted #33690 to remove this reference.

Edit 1: I'm honestly not sure what's going on here, I'll have to investigate a bit more.

Edit 2: The PR has been merged, so this is no longer required.

[codeboten]

Awesome! Thanks @jmacd