Visibility into Feature Graduation Momentum

[whitneygriffith]

Improve visibility into our list of Features, their stage and last promotion date.

The source of truth for the user facing Istio Features list is the features.yaml found in this enhancements repo.

Refine the schema and populate with known data so that users can accurately understand:

• All available features in Istio
• The current stage of each feature
• When this feature was last graduated

And for release planning to be able to:

• Automatically consume this data to highlight stale/high priority features based on time the feature was last graduated

• Update feature stage and graduation history in a given release

• Track activity, change notes, etc for a given Feature Area with the aim of indicating feature interest and priority for graduation

• Does this overlap with annotations.yaml?

[whitneygriffith]

I am thinking the addition of a since field to features schema can aid this effort.

Also, leveraging a yaml to csv converter to populate a google sheet with formulas to aid release planning.

[whitneygriffith]

#146

[whitneygriffith]

What triggers the syncing of Enhancements repo features.yaml with the Istio.io features.yaml as seen here? istio/istio.io#13519

[craigbox]

What triggers the syncing of Enhancements repo features.yaml with the Istio.io features.yaml as seen here? istio/istio.io#13519

Every day at 2am, this job runs: https://github.com/istio/test-infra/blob/master/prow/config/jobs/istio.io.yaml#L75

It does a make update_ref_docs, which runs `scripts/grab_reference_docs.sh.