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Added basic docs
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@ -245,6 +245,11 @@ summarize($myinterval, sum, false)
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Grafana has global built-in variables that can be used in expressions in the query editor.
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### Time range variables
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Grafana has two built in time range variables in `$__from` and `$__to`. They are currently always interpolated
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as epoch milliseconds.
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### The $__interval Variable
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This $__interval variable is similar to the `auto` interval variable that is described above. It can be used as a parameter to group by time (for InfluxDB, MySQL, Postgres, MSSQL), Date histogram interval (for Elasticsearch) or as a *summarize* function parameter (for Graphite).
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