GCP - "kubectl rollout restart" results: error: unknown command "restart"
Solution 1:
kubectl rollout restart doesn't work beacuse you client version is v1.13.11.
restart command was added in 1.15 as states in changelog for v1.15:
Create a new kubectl rollout restart command that does a rolling restart of a deployment.
You can find kubernetes client binaries for you server version here.
Download it, unpack and use.
And always try to make sure your server and client versions match.