||A MemorySampler obtains samples from a Sampler and stores them
in memory for display through the administrative UI.
||Represents a single sample taken of a service's property.
||A SampleEvent represents a set of Samples from different
properties all taken at about the same time.
||A log event which represents a SampleEvent
||A Sampler is the base class for services that wish to keep a
list of statistics about other services.
||This provides a facility to direct SampleEvents to Log Listeners.