upgrading_to_v26.0.md

Upgrading to v26.0

The v26.0 release of kubernetes-engine is a backwards incompatible release.

release_channel now defaults to REGULAR

For all clusters release_channel now defaults to REGULAR, this was already the default for safer_cluster variants.

To opt out of using a release channel, set release_channel to "UNSPECIFIED".

  module "gke" {
-   source           = "terraform-google-modules/kubernetes-engine"
-   version          = "~> 25.0"
+   source           = "terraform-google-modules/kubernetes-engine"
+   version          = "~> 26.0"
...
+   release_channel = "UNSPECIFIED"
}