fix(studio): wait for studio metrics publish to complete on end

[shcheklein]

W/o this fix in the example-get-started-experiments we are not getting images published to Studio (it doesn't have time to complete, evaluate exits faster).

---

• [X] ❗ I have followed the Contributing to DVCLive guide.

• [X] 📖 If this PR requires documentation updates, I have created a separate PR (or issue, at least) in dvc.org and linked it here.

Thank you for the contribution - we'll try to review it as soon as possible. 🙏

[dberenbaum]

Looking at the discussion from when we added threads, I think this was intentional and is why the thread has daemon=True. Some questions:

1. Does dropping daemon=True accomplish the same thing?
2. What happens if any call to Studio hangs? I think that was why I added daemon=True.
3. Could we make a final data post to Studio in the main thread? That would ensure the final data is posted without needing every post to return.

[shcheklein]

Looking at the discussion from when we added threads, I think this was intentional and is why the thread has daemon=True. Some questions:

Right, but at the end of the process if becomes unpredictable / we are losing data ... not sure this is expected tbh ...

Does dropping daemon=True accomplish the same thing?

We would need probably then a way to signal that thread to complete?

Does dropping daemon=True accomplish the same thing?

In this case it be waiting only at the end ... we can probably put some timeout? But as far as I understand we already do have some timeouts on post to studio call. So, it should not be infinite ...

That would ensure the final data is posted without needing every post to return.

Could you clarify please? Not sure how this idea is easier / can help tbh ...

[shcheklein]

I assume that timeout is specified here:

response = requests.post(
            url,
            json=body,
            headers={
                "Content-type": "application/json",
                "Authorization": f"token {token}",
            },
            timeout=(30, 5),
        )