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Cloudwatch: Update variable query docs (#48307)

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* Cloudwatch: Update variable query docs

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Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>

Co-authored-by: Christopher Moyer <35463610+chri2547@users.noreply.github.com>
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  1. 61
      docs/sources/datasources/aws-cloudwatch/template-queries-cloudwatch.md

61
docs/sources/datasources/aws-cloudwatch/template-queries-cloudwatch.md
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@ -13,51 +13,36 @@ For an introduction to templating and template variables, refer to the [Templati
## Query variable
The CloudWatch data source provides the following queries that you can specify in the `Query` field in the Variable edit view. They allow you to fill a variable's options list with things like `region`, `namespaces`, `metric names` and `dimension keys/values`.
In place of `region` you can specify `default` to use the default region configured in the data source for the query,
e.g. `metrics(AWS/DynamoDB, default)` or `dimension_values(default, ..., ..., ...)`.
The CloudWatch data source provides the following queries that you can specify in the `Query Type` field in the Variable edit view. They enable you to fill a variable's options list with values such as `region`, `namespaces`, `metric names` and `dimension keys/values`.
Read more about the available dimensions in the [CloudWatch Metrics and Dimensions Reference](https://docs.aws.amazon.com/AmazonCloudWatch/latest/monitoring/CW_Support_For_AWS.html).
| Name | Description |
| ----------------------------------------------------------------------- | ---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `regions()` | Returns a list of all AWS regions |
| `namespaces()` | Returns a list of namespaces CloudWatch support. |
| `metrics(namespace, [region])` | Returns a list of metrics in the namespace. (specify region or use "default" for custom metrics) |
| `dimension_keys(namespace)` | Returns a list of dimension keys in the namespace. |
| `dimension_values(region, namespace, metric, dimension_key, [filters])` | Returns a list of dimension values matching the specified `region`, `namespace`, `metric`, `dimension_key` or you can use dimension `filters` to get more specific result as well. |
| `ebs_volume_ids(region, instance_id)` | Returns a list of volume ids matching the specified `region`, `instance_id`. |
| `ec2_instance_attribute(region, attribute_name, filters)` | Returns a list of attributes matching the specified `region`, `attribute_name`, `filters`. |
| `resource_arns(region, resource_type, tags)` | Returns a list of ARNs matching the specified `region`, `resource_type` and `tags`. |
| `statistics()` | Returns a list of all the standard statistics |
| Name | Description |
| ------------------------- | ----------------------------------------------------------------------------------------------------------------------------------------------------------------------------- |
| `Regions` | Returns a list of all AWS regions |
| `Namespaces` | Returns a list of all the namespaces CloudWatch supports. |
| `Metrics` | Returns a list of metrics in the namespace. (specify region or use "default" for custom metrics) |
| `Dimension Keys` | Returns a list of dimension keys in the namespace. |
| `Dimension Values` | Returns a list of dimension values matching the specified `region`, `namespace`, `metric`, and `dimension_key`. You can use dimension `filters` to get more specific results. |
| `EBS Volume IDs` | Returns a list of volume ids matching the specified `region` and `instance_id`. |
| `EC2 Instance Attributes` | Returns a list of attributes matching the specified `region`, `attribute_name`, and `filters`. |
| `Resource ARNs` | Returns a list of ARNs matching the specified `region`, `resource_type` and `tags`. |
| `Statistics` | Returns a list of all the standard statistics. |
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).
## Example of templated queries
Here is an example of the dimension queries which will return list of resources for individual AWS Services:
### Using variables in queries
| Query | Service |
| ----------------------------------------------------------------------------------------------------------------------------- | ---------------- |
| `dimension_values(us-east-1,AWS/ELB,RequestCount,LoadBalancerName)` | ELB |
| `dimension_values(us-east-1,AWS/ElastiCache,CPUUtilization,CacheClusterId)` | ElastiCache |
| `dimension_values(us-east-1,AWS/Redshift,CPUUtilization,ClusterIdentifier)` | RedShift |
| `dimension_values(us-east-1,AWS/RDS,CPUUtilization,DBInstanceIdentifier)` | RDS |
| `dimension_values(us-east-1,AWS/S3,BucketSizeBytes,BucketName)` | S3 |
| `dimension_values(us-east-1,CWAgent,disk_used_percent,device,{"InstanceId":"$instance_id"})` | CloudWatch Agent |
| `resource_arns(eu-west-1,elasticloadbalancing:loadbalancer,{"elasticbeanstalk:environment-name":["myApp-dev","myApp-prod"]})` | ELB |
| `resource_arns(eu-west-1,elasticloadbalancing:loadbalancer,{"Component":["$service"],"Environment":["$environment"]})` | ELB |
| `resource_arns(eu-west-1,ec2:instance,{"elasticbeanstalk:environment-name":["myApp-dev","myApp-prod"]})` | EC2 |
Variables can be used in the variable form. Refer to the [variable syntax documentation]({{< relref "../../variables/syntax.md" >}}).
## Using JSON format template variables
Some queries accept filters in JSON format and Grafana supports the conversion of template variables to JSON.
If `env = 'production', 'staging'`, following query will return ARNs of EC2 instances which `Environment` tag is `production` or `staging`.
For example, if `env = 'production', 'staging'`, a `Resource ARNs` query with the following filter returns ARNs of EC2 instances where the `Environment` tag is equal to `production` or `staging`.
```javascript
resource_arns(us-east-1, ec2:instance, {"Environment":${env:json}})
{"Environment":${env:json}}
```
## ec2_instance_attribute examples
@ -74,12 +59,6 @@ Filters syntax:
{ "filter_name1": [ "filter_value1" ], "filter_name2": [ "filter_value2" ] }
```
Example `ec2_instance_attribute()` query
```javascript
ec2_instance_attribute(us - east - 1, InstanceId, { 'tag:Environment': ['production'] });
```
### Selecting attributes
Only 1 attribute per instance can be returned. Any flat attribute can be selected (i.e. if the attribute has a single value and isn't an object or array). Below is a list of available flat attributes:
@ -113,10 +92,4 @@ Only 1 attribute per instance can be returned. Any flat attribute can be selecte
- `VirtualizationType`
- `VpcId`
Tags can be selected by prepending the tag name with `Tags.`
Example `ec2_instance_attribute()` query
```javascript
ec2_instance_attribute(us - east - 1, Tags.Name, { 'tag:Team': ['sysops'] });
```
You can select tags by prepending the tag name with `Tags.`. For example, the tag `Name` is selected with `Tags.Name`.

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