I got undercloud certificate expired and cannot find the best procedure to update the certificate. Do you have any link to Read The Following Material/Manual?

I cannot find anything useful. As "openstack undercloud install|upgrade --force-stack-update" fails at step below:

"logical_resource_id": "undercloud", "resource_status_reason": "Resource CREATE failed: StackValidationFailed: resources.UndercloudServiceChain.resources.ServiceChain: Property error: ServiceChain.resources[18].properties: Property RootStackName not assigned", "resource_status": "CREATE_FAILED", "physical_resource_id": "50784129-526c-4f14-83d3-7a0c51a7cbd9", "id": "d3b641cb-8ec0-422b-a012-8b14c9724270"}]}
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