[ci] indicate support of Monterey

[StrikerRUS]

According to the policy, we indicate support only for the last 3 macOS versions in wheel name: #2691 (comment).

I believe that "the last 3 macOS versions" means 3 last major releases like it was before 11.x

Successfully built bottles for arm64_monterey, arm64_big_sur, monterey, big_sur, catalina, mojave by Homebrew team give some confidence in that LightGBM is indeed compatible with the wide range of macOS versions.
https://github.com/Homebrew/homebrew-core/blob/4060c0ab42d8b9b7168b34f55f12e16a91b27150/Formula/lightgbm.rb#L10-L15

Just FYI, it is now possible to provide one universal2 wheel for both x86_64 and arm64.

• https://discuss.python.org/t/apple-silicon-and-packaging/4516
• Please provide universal2 wheels on macOS numpy/numpy#18143

[StrikerRUS]

CI is failing with

ERROR: lightgbm-3.3.1-py3-none-macosx_10_15_x86_64.macosx_11_6_x86_64.macosx_12_0_x86_64.whl is not a supported wheel on this platform.

This is because Mojave is used at our macOS CI worker:

Operating System
Mac OS X
10.14.6
18G9323

I suggest to keep Mojave support for now then.

[jameslamb]

Thanks for this. I agree with your interpretation of "last 3 major versions".

[StrikerRUS]

I agree with your interpretation of "last 3 major versions".

Just to clarify, right now due to the restrictions of our CI (#4732 (comment)) we are supporting "last 4 major versions", not 3.

We may consider migrating to a newer macOS builder like XGBoost recently did: dmlc/xgboost#7382.
But it will require updating info about the Xcode version used to create release artifacts in two places
https://github.com/microsoft/LightGBM/tree/master/python-package#install-from-pypi

LightGBM/.ci/setup.sh

Line 7 in dcae8dd

sudo xcode-select -s /Applications/Xcode_9.4.1.app/Contents/Developer || exit -1

because the minimum available version of Xcode at macos-10.15 builder is 10.3
https://github.com/actions/virtual-environments/blob/main/images/macos/macos-10.15-Readme.md#xcode

And I don't know whether new artifacts will remain backward compatible.

[jameslamb]

Got it, yep thanks for the further explanation. Makes sense to me.

[github-actions]

This pull request has been automatically locked since there has not been any recent activity since it was closed. To start a new related discussion, open a new issue at https://github.com/microsoft/LightGBM/issues including a reference to this.