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Minor metric type documentation fixups. 

Change-Id: Ib01ab728e9f0a6b15c23f1cde84161efe9f89e33
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Julius Volz 2014-02-25 15:27:27 +01:00
parent 91aebda74d
commit 688f4f43c3
1 changed files with 5 additions and 4 deletions
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@ -90,8 +90,9 @@ Great! Look at this list and now think about the definitions above for
_Counter_ and _Gauge_. Can you identify what instruments are what? (Again,
I'll wait for you.)
* Tachometer: Counter. Tricky. The vehicle's sensors observe how quickly the
flywheel rotates and updates the instrument's value on frequent intervals.
* Tachometer: Counter. Tricky. The vehicle's sensors observe how quickly
the flywheel rotates and update the instrument's value on frequent
intervals by counting revolutions.
* Clock: Gauge. It is an external value, and we cannot watch the clock's
internal events.
* Thermometer: Gauge. It measures an external value, and there is no way to
@ -117,8 +118,8 @@ following information:
* the count of events that have been observed.
This is quite convenient, for if you are interested in tracking latencies of an
operation in real time, you three types of information reported for free with
one metric.
operation in real time, you get three types of information reported for free
with one metric.
# Acknowledgements
Robert Bray: Vehicle Instrument Panel