From what I can see the values returned are updated very quickly - maybe every second?  I'm unclear as to how to contextualize the metrics for a periodic collection.  Specifically, if I call the API every minute I may get a value for global references that is very low or very high - but it may not be indicative of the value over time. Is there any information on how the metrics are calculated internally that might help? Single points in time may be very deceptive.