Upgrade domain selection for service fabric

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If I have say few upgrade domains in service fabric. how does service fabric selects upgrade domains while performing upgrades?

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From https://learn.microsoft.com/en-us/azure/service-fabric/service-fabric-application-upgrade#rolling-upgrades-overview

Update domains do not receive updates in a particular order.

However, using the start-servicefabricclusterupgrade commandlet, you can specify -SortOrder, which

Defines the order in which an upgrade proceeds through the cluster.

Note that Default

Indicates that the default sort order (as specified in cluster manifest) will be used.

In my experience (mostly on-prem standalone clusters) for Configuration updates, I'm 99% sure it does them in sequential order: UD0, UD1, etc.