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update docs

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Mitsuhiro Tanda
2019-02-07 20:16:20 +09:00
parent 4bd94b8aba
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10
docs/sources/features/datasources/cloudwatch.md
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@@ -214,6 +214,16 @@ Example `ec2_instance_attribute()` query
ec2_instance_attribute(us-east-1, Tags.Name, { "tag:Team": [ "sysops" ] })
```
## Using json format template variables
Some of query takes JSON format filter. Grafana support to interpolate template variable to JSON format string, it can use as filter string.
If `env = 'production', 'staging'`, following query will return ARNs of EC2 instances which `Environment` tag is `production` or `staging`.
```
resource_arns(us-east-1, ec2:instance, {"Environment":${env:json}})
```
## Cost
Amazon provides 1 million CloudWatch API requests each month at no additional charge. Past this,