Eric Fried

`format=duration` kubebuilder validation accepts `d`, `w`; metav1.Duration does not

3

Despite validation of type=duration being [documented](https://github.com/kubernetes/apiextensions-apiserver/blob/29400d7010f44f7d6ad2c6762604185143382598/pkg/apis/apiextensions/v1/types_jsonschema.go#L51) as parsed by time.ParseDuration, which is [what the unmarshaller does](https://github.com/kubernetes/apimachinery/blob/df993592a122931b8aac4db57689e09458a2332c/pkg/apis/meta/v1/duration.go#L39), it is actually [parsed](https://github.com/kubernetes/apiextensions-apiserver/blob/29400d7010f44f7d6ad2c6762604185143382598/pkg/apiserver/schema/cel/values.go#L135) by strfmt.ParseDuration, which is more lenient in that it [accepts...

metav1.Duration doesn't parse `d`, `w`; conflicts with kubebuilder `format=duration` validation

5

Despite validation of type=duration being [documented](https://github.com/kubernetes/apiextensions-apiserver/blob/29400d7010f44f7d6ad2c6762604185143382598/pkg/apis/apiextensions/v1/types_jsonschema.go#L51) as parsed by time.ParseDuration, which is [what the unmarshaller does](https://github.com/kubernetes/apimachinery/blob/df993592a122931b8aac4db57689e09458a2332c/pkg/apis/meta/v1/duration.go#L39), it is actually [parsed](https://github.com/kubernetes/apiextensions-apiserver/blob/29400d7010f44f7d6ad2c6762604185143382598/pkg/apiserver/schema/cel/values.go#L135) by strfmt.ParseDuration, which is more lenient in that it [accepts...

Interface for MetricVec (and subclasses)

3

Having an interface for MetricVec funcs like [Must]CurryWith, With[LabelValues], etc. -- parallel to ObserverVec -- would make it possible to generate mocks and thus facilitate unit testing for CounterVec, GaugeVec,...