Add a versioning mechanism for tracking the release of knative components.

[evankanderson]

Adds a label, serving.knative.dev/release, to all the yaml, and sets the tag during release to the ${TAG} value, if present. This should make it easier to identify what release is currently running in a cluster, and clean up old components after an upgrade.

Proposed Changes

• Adds a label, serving.knative.dev/release, to all the yaml, and sets the tag during release to the ${TAG} value.
• Development builds will be tagged with a devel label.

Release Note

* Adds a label, `serving.knative.dev/release` to knative serving components.

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[evankanderson]

Not sure if we'd want to use a different release label for the monitoring components... would like your opinion.

/assign @mattmoor
/assign @adrcunha
/assign @mdemirhan

[jonjohnsonjr]

There's a typo in your rrelease note.

[evankanderson]

/retest

[mattmoor]

🤔 I feel like we should be thinking through --prune for install cleanup as part of this change. WDYT?

[evankanderson]

Did you have a particular concern or suggestion? I think if we install all components into one namespace, the interesting question will be how to deal with customization and configuration.

…

On Thu, Jan 17, 2019, 5:35 PM Matt Moore ***@***.***> wrote: 🤔 I feel like we should be thinking through --prune for install cleanup as part of this change. WDYT? — You are receiving this because you were mentioned. Reply to this email directly, view it on GitHub <#2820 (comment)>, or mute the thread <https://github.com/notifications/unsubscribe-auth/AHlyN4BzlF6KESs0YlNpv0PPFaUErXXUks5vESTfgaJpZM4ZlyAf> .

[mattmoor]

/lgtm