Terraform-provider-aws: cloudwatch - Add Alarms on Metric Math Expressions

[nirpod]

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Description

need to add support for this new feature:
Amazon CloudWatch Launches Ability to Add Alarms on Metric Math Expressions

New or Affected Resource(s)

aws cloudwatch alarms

References

https://aws.amazon.com/about-aws/whats-new/2018/11/amazon-cloudwatch-launches-ability-to-add-alarms-on-metric-math-expressions/

[dpetzold]

Below is a proposed implementation spec. Please let me know what you think.

Theaws_cloudwatch_metric_alarm resource would be need to support a new nested block metric which would look like the following:

metric {                                                                                                             
    stat {                                                                                                           
        name = "ConnectionsFailed"                                                                                   
        namespace = "MyService"                                                                                      
        period = 60                                                                                                  
        stat = "Sum"                                                                                                 
    }                                                                                                                
    id = "m1"                                                                                                        
}                                                                                                                    

metric {                                                                                                             
    stat {                                                                                                           
        name = "ConnectionsDropped"                                                                                  
        namespace = "MyService"                                                                                      
        period = 60                                                                                                  
        stat = "Sum"                                                                                                 
    }                                                                                                                
    id = "m2"                                                                                                        
}                                                                                                                    

metric {                                                                                                             
    stat {                                                                                                           
        name = "RequestsThrottled"                                                                                   
        namespace = "MyService"                                                                                      
        period = 60                                                                                                  
        stat = "Sum"                                                                                                 
    }                                                                                                                
    id = "m3"                                                                                                        
}                                                                                                                     

metric {                                                                                                             
    stat {                                                                                                           
        name = "ConnectionAttempts"                                                                                  
        namespace = "MyService"                                                                                      
        period = 60                                                                                                  
        stat = "Sum"                                                                                                 
    }                                                                                                                
    id = "m4"                                                                                                        
 }                                                                                                             

metric {                                                                                                             
    id = "error_total"                                                                                               
    expression = "m1+m2+m3"                                                                                          
}                                                                                                                    

metric {                                                                                                             
    id = "error_rate"                                                                                                
    expression = "(error_total/m4)*100"                                                                              
    label = "Total Connection Error Rate"
    return_data = "true"                                                                        
}

Where:

• return_data defaults to false.
• stat and expression are mutually exclusive.

Notice I folded in the Metric structure into MetricStat and renamed MetricStat to stat. I think that makes more sense from a configuration usage perspective but now it is no longer one-to-one.

https://www.terraform.io/docs/providers/aws/r/cloudwatch_metric_alarm.html
https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/API_PutMetricAlarm.html
https://docs.aws.amazon.com/sdk-for-go/api/service/cloudwatch/#CloudWatch.PutMetricAlarm
https://docs.aws.amazon.com/sdk-for-go/api/service/cloudwatch/#MetricDataQuery
https://docs.aws.amazon.com/sdk-for-go/api/service/cloudwatch/#MetricStat

[kakmt]

How's https://github.com/terraform-providers/terraform-provider-aws/pull/6833 going?

[benlamonica]

Hi @bflad,
Would you consider merging Metric Math Expression support in? Are there any specific concerns with this implementation? I need this functionality and have been waiting for a while now. Will you give us an idea of when this can be merged?

[shaiguitar]

Any update on this PR? Would be great to have a new version with working cw math expressions in place.

[shaiguitar]

Bump - looking forward to seeing this get in. If there's something else pending on this I am happy to take a look/help out. Thanks in advance!

[bflad]

Support for math expression metric alarms (via a new metric_query configuration block) has been merged and will release with version 1.59.0 of the Terraform AWS Provider, likely middle of this week. The resource documentation will include an example of how to set these up. 🚀

[shaiguitar]

Thanks @bflad - out of curiosity for the impatient; is there a method or docs on how to use a work-in-progress terraform AWS provider/git branch to test out the functionality until an official provider is released?

Thanks for all the work you do.

[bflad]

@shaiguitar the README instructions should get you on your way to a custom built provider locally (e.g., a Go 1.11.4+ environment using make build) and points to the Terraform instructions for installing a plugin since you will want to use a local custom built binary instead of one downloaded by terraform init. The only very recent change to those instructions as written is that working inside the GOPATH is optional now since we have migrated this codebase to Go modules.

If you have any issues with those instructions, I would suggest opening a new GitHub issue.

[shaiguitar]

Any update on a release with this feature (end of week)?

[bflad]

This has been released in version 1.59.0 of the AWS provider. Please see the Terraform documentation on provider versioning or reach out if you need any assistance upgrading.

[shaiguitar]

Verified this works as expected, thanks!

On Thu, Feb 14, 2019, 18:46 Brian Flad <[email protected] wrote:

This has been released in version 1.59.0 of the AWS provider
https://github.com/terraform-providers/terraform-provider-aws/blob/master/CHANGELOG.md#1590-february-14-2019.
Please see the Terraform documentation on provider versioning
https://www.terraform.io/docs/configuration/providers.html#provider-versions
or reach out if you need any assistance upgrading.

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