Sometimes you need to count stuff. Maybe you need to know how long something took.
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buckets Each stat is in it's own "bucket". They are not predefined anywhere. Buckets can be named anything that will translate to Graphite (periods make folders, etc)
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values Each stat will have a value. How it is interpreted depends on modifiers
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flush After the flush interval timeout (default 10 seconds), stats are munged and sent over to Graphite.
gorets:1|c
This is a simple counter. Add 1 to the "gorets" bucket. It stays in memory until the flush interval.
glork:320|ms
The glork took 320ms to complete this time. StatsD figures out 90th percentile, average (mean), lower and upper bounds for the flush interval.
gorets:1|c|@0.1
Tells StatsD that this counter is being sent sampled ever 1/10th of the time.
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UDP Client libraries use UDP to send information to the StatsD daemon.
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NodeJS
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Graphite