Merge pull request #4775 from serngawy/issue-4774

📖 Improve ROSA quickstart with MachinePool and troubleshooting guide

Author: k8s-ci-robot

docs/book/src/topics/rosa/enabling.md

@@ -4,5 +4,34 @@ To enable support for ROSA clusters, the ROSA feature flag must be set to true.
 
 ```shell
 export EXP_ROSA="true"
+export EXP_MACHINE_POOL="true"
 clusterctl init --infrastructure aws
+```
+
+## Troubleshooting
+To check the feature-gates for the Cluster API controller run the following command:
+
+```shell
+$ kubectl get deploy capi-controller-manager -n capi-system -o yaml
+```
+the feature gate container arg should have `MachinePool=true` as shown below.
+
+```yaml
+spec:
+  containers:
+  - args:
+    - --feature-gates=MachinePool=true,ClusterTopology=true,...
+```
+
+To check the feature-gates for the Cluster API AWS controller run the following command:
+```shell
+$ kubectl get deploy capa-controller-manager -n capa-system -o yaml
+```
+the feature gate arg should have `ROSA=true` as shown below.
+
+```yaml
+spec:
+  containers:
+  - args:
+    - --feature-gates=ROSA=true,...
 ```