1. A computer implemented method for managing virtualized process collections, the computer implemented method comprising: receiving performance metrics for a virtualized process collection running in a first logical partition; calculating a threshold value for the performance metrics; executing a performance state analysis of the performance metrics to determine whether the calculated threshold value of the performance metrics exceed a maximum or minimum threshold specified in a stack tier policy for the virtualized process collection; executing a stack tier analysis of the performance metrics to identify any trigger violations and determine a migration action to be taken for the virtualized process collection; and responsive to a determination that a number comprising the identified trigger violations exceeds a trigger violation count, generating a migration event to migrate the virtualized process collection to a second logical partition.