NewUtilizationTracker instantiates and configures a utilization tracker that calculates the values and publishes them to expvars.

NewWorker returns an instance of a `Worker` after parameter sanity checks are passed.

CheckLogger is the object responsible for logging the information generated during the running of the check.

Worker is an object that encapsulates the logic to manage a loop of processing checks over the provided `PendingCheckChan`.

UtilizationTracker is the interface that encapsulates the API around the utilizationTracker object.