I have an umbrella Helm chart containing different sub-charts (including a RabbitMQ-ha). I am able to easily install this helm chart on a k8s cluster but I want to know is it possible to just install this helm chart (or any ready to use helm chart) on a multi-cluster k8s or I have to change the chart and make it compatible with a multi-cluster setup?
I have to mention that my chart requires dns and metric-server.
If by multi-cluster Kubernetes clusters you mean using federation (Federation v2) which syncs resources across clusters based on the user defined policies, e.g. ensure that Deployments created by helm exists in multiple clusters - in this case you use single umbrella Helm chart like you were working with single cluster.
If by multi-cluster you mean multiple standalone/self-contains clusters, then you need to have probably a customized version of the same umbrella chart with cloud provider specific values - check how to achieve that with the idea using one of the helmfile feature called templatization. This article shows how to do that.