Deprecate ImageTagTransformer legacy filter

[annasong20]

The ImageTagTransformer backing the Kustomize images field is currently backed by 2 filters. We should deprecate the legacy filter. #4814 motivated this issue.

I've noticed the following differences between the non-legacy and legacy filters. The deprecation assignee should investigate the two more thoroughly to ensure that the legacy filter deprecation doesn't have unintended consequences.

• The legacy filter applies to all fields named containers and initContainers regardless of field path. Users can workaround this by specifying FieldSpecs for the non-legacy filter.
• The legacy filter behaves the same regardless of whether the user invokes the image tag transformer via the Kustomize images or transformers field. The non-legacy requires users to pass in FieldSpecs when invoked via the transformers field.

As a result of the subpar UX in the 2nd bullet, #4404 blocks the legacy filter's deprecation.

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[natasha41575]

If someone wants this to move forward more quickly, you can start by taking a look at the blocking issue #4404. It is currently assigned to someone, but AFAIK they haven't started it yet and probably won't get to it for a little bit.

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/lifecycle stale

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/lifecycle rotten

[k8s-triage-robot]

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• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
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/close not-planned

[k8s-ci-robot]

@k8s-triage-robot: Closing this issue, marking it as "Not Planned".

In response to this:

The Kubernetes project currently lacks enough active contributors to adequately respond to all issues and PRs.

This bot triages issues according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
• After 30d of inactivity since lifecycle/stale was applied, lifecycle/rotten is applied
• After 30d of inactivity since lifecycle/rotten was applied, the issue is closed

You can:

• Reopen this issue with /reopen
• Mark this issue as fresh with /remove-lifecycle rotten
• Offer to help out with Issue Triage

Please send feedback to sig-contributor-experience at kubernetes/community.

/close not-planned

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