Add OTLP/gRPC support

[krisztianfekete]

Problem or motivation

Some OTel clients might default to (or support only) gRPC, so agentevals should also support this.

Proposed solution

Implement OTLP/gRPC in agentevals.

Alternatives considered

Using intermediate OTel collectors.

Additional context

No response

Human confirmation

• I am a human (not a bot, agent, or AI) filing this issue.

[ajimenez1503]

Hey @krisztianfekete ,
Can I work on that one?
Thanks :)

[krisztianfekete]

Hi @ajimenez1503, absolutely, thank you!
There's also this guide to test this e2e on Kubernetes via kagent: https://github.com/agentevals-dev/agentevals/tree/main/examples/kubernetes

[krisztianfekete]

Once we have this feature, maybe we can extend this guide with recommendations on when and how to use an intermediate collector and when is it fine to just push traces directly.