NewControllerManager returns a new ControllerManager comprised of controllerGroups for each namespace included in the 'namespaces' parameter.

ValidateSchedule validates that the cron syntax is valid We use the standard format here...

Controller holds the client and informer for the controller, along with a pointer to a Scheduler.

ControllerManager manages a map of controller groups, each of which is comprised of the various controllers needed to handle events within a specific namespace.