Add Resource browser attributes

[martinkuba]

This is the same as #2115, except it only adds browser attributes. It does not include the addition of app attributes as in #2115.

[github-actions]

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[martinkuba]

@MSNev @dyladan I have updated the PR to match the low entropy user-agent client hints. These can be retrieved synchronously, and I think are useful for most common analysis.

@arminru @scheler I have updated the description for the device attributes.

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[github-actions]

Closed as inactive. Feel free to reopen if this PR is still being worked on.

[arminru]

This is pending on the discussion in #2466.

[martinkuba]

@arminru I think these attributes are needed independently of #2466, as we need some way of capturing information about browsers. The attributes are now updated to match user-agent client hints (low-entropy), which cannot be captured in the process.runtime.* attributes alone.

Whether we use presence of these attributes to classify browser telemetry can be a separate discussion. I originally combined those two topics in this PR, but now realize that it may just confuse the matter. I can update the description of the PR and perhaps remove the part about device attributes?

[arminru]

@martinkuba

I can update the description of the PR and perhaps remove the part about device attributes?

I think the device part looks good and is small and related enough to be discussed in the same PR but you could also split this up if you prefer, sure.

[dyladan]

Seems fine to me. Using newer APIs means it will continue being relevant for a longer time than the old APIs even if coverage isn't great right now (missing in at least firefox and safari). The newer APIs are also clearer than the old user agent.

[arminru]

LGTM from a general spec/semconv POV. Thank you, @martinkuba!
I'll rely on the Client instrumentation/RUM SIG to asses the suitability of the proposed values and their sources.

[martinkuba]

@yurishkuro This PR needs one more approval before it can be merged. Can you please take a look?

[github-actions]

This PR was marked stale due to lack of activity. It will be closed in 7 days.

[carlosalberto]

@open-telemetry/specs-approvers Please review before we merge ;)