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deprecation-policy.md

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Skaffold deprecation policy

Skaffold adopts the Kubernetes deprecation policy for admin facing components. In summary, deprecations to a flag or CLI command require the following notification periods, depending on the release track:

Release Track Deprecation Period
Alpha (experimental) 0 releases
Beta (pre-release) 3 months or 1 release (whichever is longer)
GA (generally available) 6 months or 1 release (whichever is longer)

Breaking changes A breaking change is when the primary functionality of a feature changes in a way that the user has to make changes to their workflows/configuration.

  • Breaking config change: In case of Skaffold's pipeline config (skaffold.yaml) a breaking change between an old and new version occurs when the skaffold binary cannot parse the input yaml with auto-upgrade. This can happen when the new version removes a feature or when the new version introduces a mandatory field with no default value
  • Breaking functional change: functional changes that force user workflow changes even when the config is the same or upgradeable.

How do we deprecate things?

A "deprecation event" would coincide with a release.

  1. We document the deprecation in the following places if applicable

    1. Document changes in relevant sections. These docs will be published to offical skaffold website
    2. Release notes
    3. Command help
    4. Log messages
    5. https://skaffold.dev/docs/references/yaml/
    6. deprecation policy

  2. if applicable, from the kubernetes policy:

    Rule #6: Deprecated CLI elements must emit warnings (optionally disable) when used.

Current maturity of skaffold

Skaffold.yaml (pipeline config)

The pipeline config, i.e. skaffold.yaml is beta.

This means that you can safely depend on the skaffold config with the assumption that skaffold will auto-upgrade to the latest version:

  • Removal and non-upgradable changes are subject to the deprecation policy for all (even new) features under the config.
  • Auto-upgradable changes are not considered breaking changes.

Skaffold components

We are committed to design for auto-upgradeable changes in the config. However the behavior of individual component might suffer breaking changes depending on maturity.

  • Filewatcher: beta
  • Builders
    • local: beta
    • googleCloudBuild: beta
    • kaniko: beta
    • plugins gcb: alpha
  • Artifact types:
    • Dockerfile: beta
    • Bazel: beta
    • Jib: beta
  • Filesync: alpha
  • Port-forwarding: alpha
  • Taggers: beta
    • gitCommit : beta
    • sha256: beta
    • dateTime : beta
    • envTagger: beta
  • Testers: alpha
    • Structure tests: alpha
  • Deployers: beta
    • Helm: beta
    • Kustomize: beta
    • Kubectl: beta
  • Profiles: beta
  • Debug: alpha

Skaffold commands

Commands and their flags are subject to the deprecation policy based on the following table list:

  • build: beta
  • completion: beta
  • config: alpha
  • debug: alpha
  • delete: beta
  • deploy: beta
  • dev: beta
  • diagnose: beta
  • fix: beta
  • help: beta
  • init: alpha
  • run: beta
  • version: beta

Current deprecation notices

03/15/2019: With release v0.25.0 we mark for deprecation the flags field in kaniko (KanikoArtifact.AdditionalFlags) , instead Kaniko's additional flags will now be represented as unique fields under kaniko per artifact (KanikoArtifact type). This flag will will be removed earliest 06/15/2019.

02/15/2019: With release v0.23.0 we mark for deprecation the following env variables in the envTemplate tagger:

  • DIGEST
  • DIGEST_ALGO
  • DIGEST_HEX Currently these variables resolve to _DEPRECATED_<envvar>_, and the new tagging mechanism adds a digest to the image name thus it shouldn't break existing configurations. This backward compatibility behavior will be removed earliest 05/14/2019.