add single-CPU K8s node warning to helm 'get-started' guide
@@ -19,6 +19,19 @@ You will need to have Kubernetes set up. To get up and running fast,
you might want to use `minikube` or `kubeadm`. Any other Kubernetes
setup will work as well though.
+When using a cluster in the cloud (e.g. GKE), use nodes with at least 2 CPU's.
+When using nodes with only 1 CPU (like `n1-standard-1`), an upgrade
+may be stuck with not enough CPU resources. This issue usually manifests itself
+in the form of pods hanging in the PENDING state, which looks something like:
+
+```sh
+$ kubectl describe pod/helloworld-... | tail -3
+Events:
+ Type Reason Age From Message
+ ---- ------ ---- ---- -------
+ Warning FailedScheduling 3m (x37 over 13m) default-scheduler 0/2 nodes are available: 2 Insufficient cpu.
+```
+
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- On MacOS:
