Enhancements to the GCP Exporter

[snehilchopra]

The current GCP exporter interface is not fully complete and needs to address a few improvements

• Set retries for RPCs - This is an improvement from the OpenCensus Implementation which just prints out the error on failure

• Set more quotas and limits conforming to the official specs

[snehilchopra]

@IlyaKobelevskiy @ZiweiZhao

[psx95]

Moving this to p3 since C++ is not a priority right now.

[dbolduc]

FYI: I have made some progress on this. It lives in a branch over here in Google's Cloud C++ repo: https://github.com/dbolduc/google-cloud-cpp/tree/ot-cpp-walkthrough/google/cloud/trace/exporter

It uses the C++ Cloud Trace client, so it has retries and all the other goodies you get from using the client library instead of raw gRPC.

Writing the exporter is a P2 OKR for me this quarter, but I am woefully behind in my work. I don't expect to get it done until 2023 Q1.

[dashpole]

@dbolduc would you be interested in contributing the improvements to this repository?

[dbolduc]

would you be interested in contributing the improvements?

Yes!

...to this repository?

No.

I am fairly certain I want to keep the exporter in googleapis/google-cloud-cpp. I don't want to set up the build / test infrastructure in this repo. The exporter depends on google-cloud-cpp's trace library... so customers already needs to be familiar with how to build google-cloud-cpp. It seems like a benefit to have one less dependency.

If you are concerned about discoverability, we can always leave a using GcpExporter = ... in this repo, which points to google-cloud-cpp.

If this is controversial, I can write a doc.

[punya]

@dbolduc weighing in on behalf of the OTel team because @dashpole will be out for a few weeks. We agree with your reasoning for keeping the C++ exporter in googleapis/google-cloud-cpp. Let's meet separately to figure out

• your team's and our team's responsibilities for the exporter in its new location
• the most lightweight way to preserve discoverability

[dbolduc]

We have an experimental Cloud Trace exporter over at:
https://github.com/googleapis/google-cloud-cpp/tree/main/google/cloud/opentelemetry

The quickstart for it is:
https://github.com/googleapis/google-cloud-cpp/tree/main/google/cloud/opentelemetry/quickstart