1. A computer implemented method for determining a target logical partition for a migration event of a virtualized process collection at runtime, the computer implemented method comprising: responsive to detecting a violation of a stack tier policy for the virtualized process collection in a source logical partition, examining a stack tier comprising the virtualized process collection to determine a scalability of the stack tier, wherein the virtualized process collection is a plurality of related virtualized process instances, and wherein the scalability of the stack tier specifies a manner of relocating the virtualized process collection in the stack tier for the migration event; analyzing a performance state of the virtualized process collection; examining a set of logical partitions to identify target logical partitions for the migration event, wherein the target logical partitions are compatible for migrating the virtualized process collection based on the scalability of the stack tier, and wherein the target logical partitions are identified when the performance state of the virtualized process collection comprising an average of the performance metrics of the virtualized process instances in the virtualized process collection exceeds a maximum or minimum threshold in the stack tier policy; and ranking the target logical partitions for selection in the migration event based on the performance states of the virtualized process collection and the stack tier policy.