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Merge branch 'master' into patch-1

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Trent White
2017-07-27 12:15:41 -04:00
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parent dd469f01ae 1f0eb082aa
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docs/sources/reference/direct-db-connection.md
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@@ -48,6 +48,9 @@ As you can see, the Grafana-Zabbix plugin uses aggregation by a given time inter
## Functions usage with Direct DB Connection ## Functions usage with Direct DB Connection
There's only one function that changes what data comes from the backend: `consolidateBy`. Other functions still work on the client side and transform data from the backend. So mak sure to work with pre-aggregated data (by AVG, MAX, MIN, etc).
For example, let's say you want to group values by 1 hour intervals and the `max` function. If you just apply `groupBy(10m, max)` function, the result will be incorrect because the transform data aggregated by the default `AVG` function. You should use `consolidateBy(max)` coupled with `groupBy(10m, max)` in order to get the correct result. There's only one function affecting the backend. This function is `consolidateBy`, which changes what data comes from
the backend. Other functions still work on the client side and transform data that comes from the backend. So you should
clearly understand that this is pre-aggregated data (by AVG, MAX, MIN, etc).
For example, say you want to group values by 1 hour interval and `max` function. If you just apply `groupBy(10m, max)` function, your result will be wrong, because you would transform data aggregated by default `AVG` function. You should use `consolidateBy(max)` coupled with `groupBy(10m, max)` in order to get a precise result.