username

The username to use for HTTP basic authentication to the master endpoint. For clusters v1.6.0 and later, basic authentication can be disabled by leaving username unspecified (or setting it to the empty string). Warning: basic authentication is deprecated, and will be removed in GKE control plane versions 1.19 and newer. For a list of recommended authentication methods, see: https://cloud.google.com/kubernetes-engine/docs/how-to/api-server-authentication