[bug] Support handling resources in different group versions

[grzesuav]

Problem

Reported in this slack thread - to wrap up - when dealing with resources in different versions (like Ingress - "extensions/v1beta1" and "networking.k8s.io") in managing children (https://github.com/metacontroller/metacontroller/blob/master/pkg/controller/common/manage_children.go#L131) the same object is represented under two different groups, so current metacontroller logic tries to delete it (via old group handle - extensions/v1beta1) and create (via new group networking.k8s.io) which ends up in infinite loop.

Solution

• we would need to internally represent it (in metacontroller structures) using server preferred version - https://pkg.go.dev/k8s.io/apimachinery@v0.23.3/pkg/apis/meta/v1#APIGroup and being aware that they are the same object.
• other- open for suggestions

[grzesuav]

Related code example, thanks to @vmax - https://github.com/vmax/metacontroller-upgrade-ingress-apiversion