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document lookupSeries. fix #1035 #1760

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Jun 14, 2016
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document lookupSeries. fix #1035 #1760

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5 changes: 5 additions & 0 deletions docs/expressions.md
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Expand Up @@ -512,7 +512,12 @@ Returns the first count (scalar) results of number.

## lookup(table string, key string) numberSet

Returns the first key from the given lookup table with matching tags, this searches the built-in index and so only makes sense when using OpenTSDB and sending data to /index or relaying through bosun.

## lookupSeries(series seriesSet, table string, key string) numberSet

Returns the first key from the given lookup table with matching tags.
The first argument is a series to use from which to derive the tag information. This is good for alternative storage backends such as graphite and influxdb.

## month(offset scalar, startEnd string) scalar

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