Version 1.19 incorporates a number of changes and enhancements that emphasize the maturity and production readiness of kubernetes

In 1.19, Ingress graduates to general availability and is added to the networking v1 APIs. As part of this milestone, there are some key differences in v1 Ingress objects, including schema and validation changes. For example, the `pathType` field no longer has a default value and must be specified.

More info:

https://kubernetes.io/