stacks: add deferred to protobuf

[DanielMSchmidt]

Adds just the protobuf definitions for deferred actions.

Fixes #

Target Release

1.8.x

Draft CHANGELOG entry

NEW FEATURES

• stacks: add deferred actions to provider protocol

[liamcervante]

You should update the symlinked files in https://github.com/hashicorp/terraform/tree/main/internal/tfplugin5 and https://github.com/hashicorp/terraform/tree/main/internal/tfplugin6 so they point to the latest .proto files as well.

[DanielMSchmidt]

Oh these files are symlinked, that explains why I edited the wrong files 🤦

[liamcervante]

This looks good! I'm talking to the devex team tomorrow, so we should just hold off on merging this until we've got final sign off that this is all good. I'll approve after I've spoken to them - I don't anticipate any changes though.

[liamcervante]

Yeah we don't need to change UpgradeResourceState. I've added comments to the exact places in tfplugin6. You'll need to make equivalent changes to tfplugin5.

[liamcervante]

This looks good to me. I've tagged in Brian and Austin in case they want to have a final look / say, but otherwise good to merge. You can probably just merge this when you're back after Easter!

[austinvalle]

This looks good to me. I've tagged in Brian and Austin in case they want to have a final look / say, but otherwise good to merge. You can probably just merge this when you're back after Easter!

@liamcervante & @DanielMSchmidt

@bflad and I talked with @alexsomesan, @radditude, and @nfagerlund while you both were out. Brian and I want to propose some additional changes to the protocol. (as of now, only additive to what's in this PR, so not sure if that makes it a blocker)

Our main goal is to add some bits to the protocol (specifically ConfigureProvider and possibly GetProviderSchema) for the PROVIDER_CONFIG_UNKNOWN scenario, to protect existing resources that rely on provider configs being fully known to successfully plan.

We should sync up next week when you both get back. (I'm not 100% sure who from Core wants to join so I'll wait to schedule something before playing calendar roulette due to the TZ differences 😆 )

[DanielMSchmidt]

@austinvalle Reading through the proposed protocol changes they seem to be only additive to this PR, I'll therefore go ahead and merge this PR and we can do follow up once the discussion settles down on the to be added changes 👍

[github-actions]

Reminder for the merging maintainer: if this is a user-visible change, please update the changelog on the appropriate release branch.

[github-actions]

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