Release 0.20.0-alpha.3

[rerun-bot]

Next steps

• Test the release
• If this is an 'alpha' release, you can just merge the pull request.
• Otherwise:
  • For any added commits, run the release workflow in 'rc' mode again
  • After testing, _ensure that this PR is mergeable to _, then run the release workflow in 'release' mode
  • Once the final release workflow finishes it will create a GitHub release for you. Then:
    • Sanity check the build artifacts:
      • pip install: does it install and run?
      • cargo install of cli tool: does it install and run?
      • C++ SDK zip: does it contain rerun_c for all platforms?
    • Populate the release with the changelog and a nice header video/picture, check , then click .
    • Update the google colab notebooks to install this version and re-execute the notebook.

A few hours after the GitHub release is created, will create a
conda feedstock PR.
Make sure Jeremy is on top of it!

• Tests
  • Windows
  • Linux
  • MacOS

[github-actions]

Latest documentation preview deployed successfully.

Result	Commit	Link
✅	a078186	https://landing-q90jz42pv-rerun.vercel.app/docs

^{Note: This comment is updated whenever you push a commit.}

[emilk]

Build: https://github.com/rerun-io/rerun/actions/runs/11796219569

[rerun-bot]

Version 0.20.0-alpha.3 published successfully.

artifact	install
web app
wheels	pip install rerun-sdk==0.20.0-alpha.3
crates	cargo install rerun-cli@0.20.0-alpha.3
npm	npm install @rerun-io/web-viewer@0.20.0-alpha.3
docs
py docs
rs docs
cpp_sdk zip