*: Move objstore out of repo

[brancz]

• I added CHANGELOG entry for this change.
• Change is not relevant to the end user.

Changes

Closes #3701

For this to go green we first need Cortex to migrate to the new dep.

Verification

Code and tests are unchanged, it's just moving code.

cc @onprem @kakkoyun @bwplotka @squat @pracucci @yeya24

[bwplotka]

Amazing work, thanks!

[metalmatze]

Seems like there are a few more places that need their imports updated.

[phillebaba]

Do we have a plan when the switch is going to be made? Thinking where the best place to make changes is.

[kakkoyun]

@brancz @onprem If you're not on it. I'm happy to take this one over.

[yeya24]

I think it is confusing to still keep objstore in the THanos codebase. Especially we have changes like #5337.
Let's move forward this if possible...

[phillebaba]

I have a PR to update the Azure object store that I want to start testing in my environment.
thanos-io/objstore#3

Is this going to be merged or is it a safe bet to create a new PR to the Thanos repo?

[bwplotka]

Yes, we want to merge this, but it requires more work to make it happen.

Also, https://github.com/thanos-io/objstore requires more work in terms of CI and documentation. Normally I would propose to @phillebaba to work on separate repo but we (and @phillebaba) won't be able to verify if the new code works. Thus I would say, unless @kakkoyun @brancz @yeya24 or anyone else has time to finalize this work within next 2 weeks - we should, unfortunately, stick to Thanos codebase. I am ultra busy with book for next weeks, will have more time after that ):

[kakkoyun]

Yes, we want to merge this, but it requires more work to make it happen.

Also, https://github.com/thanos-io/objstore requires more work in terms of CI and documentation. Normally I would propose to @phillebaba to work on separate repo but we (and @phillebaba) won't be able to verify if the new code works. Thus I would say, unless @kakkoyun @brancz @yeya24 or anyone else has time to finalize this work within next 2 weeks - we should, unfortunately, stick to Thanos codebase. I am ultra busy with book for next weeks, will have more time after that ):

I'm happy to help with this issue and handle the CI work for the separate repo. Is anyone working on anything related to this?
Otherwise, I'll start planning my time for this.

[bwplotka]

Check with your CEO, otherwise I think you are good ((((:

[brancz]

Last I chatted with @onprem he wanted to do this and there was also a discussion about first removing the cortex dependency. Otherwise very happy if someone gets this moving!

[kakkoyun]

It was easier to start over than fix the resolve conflicts #5510