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Merge pull request #3085 from mtanda/cloudwatch_template_doc
Add templating explanation to CloudWatch docs.
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You need to specify a namespace, metric, at least one stat, and at least one dimension.
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## Templated queries
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CloudWatch Datasource Plugin provides the following functions in `Variables values query` field in Templating Editor to query `region`, `namespaces`, `metric names` and `dimension keys/values` on the CloudWatch.
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Name | Description
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------- | --------
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`regions()` | Returns a list of regions AWS provides their service.
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`namespaces()` | Returns a list of namespaces CloudWatch support.
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`metrics(namespace)` | Returns a list of metrics in the namespace.
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`dimension_keys(namespace)` | Returns a list of dimension keys in the namespace.
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`dimension_values(region, namespace, metric)` | Returns a list of dimension values matching the specified `region`, `namespace` and `metric`.
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For details about the metrics CloudWatch provides, please refer to the [CloudWatch documentation](https://docs.aws.amazon.com/AmazonCloudWatch/latest/DeveloperGuide/CW_Support_For_AWS.html).
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If you want to filter dimension values by other dimension key/value pair, you can specify optional parameter like this.
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```sql
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dimension_values(region, namespace, metric, dim_key1=dim_val1,dim_key2=dim_val2,...)
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```
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## Cost
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