(aws-cloudwatch): add support for band annotations

[ErrorsAndGlitches]

Describe the feature

CloudWatch dashboards support creating band annotations via horizontal annotations:

• https://docs.aws.amazon.com/AmazonCloudWatch/latest/APIReference/CloudWatch-Dashboard-Body-Structure.html#CloudWatch-Dashboard-Properties-Metrics-Array-Format

To create such an annotation, the format must be:

[ {value, label, color, yAxis, visible}, {value, label} ]

However, the GraphWidget class does not support this:

• https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_cloudwatch.GraphWidgetProps.html
• https://docs.aws.amazon.com/cdk/api/v2/docs/aws-cdk-lib.aws_cloudwatch.HorizontalAnnotation.html

Use Case

To create banded annotations.

Proposed Solution

No response

Other Information

No response

Acknowledgements

• I may be able to implement this feature request
• This feature might incur a breaking change

CDK version used

2.35.0 (build 5c23578)

Environment details (OS name and version, etc.)

AL2

[peterwoodworth]

Thanks for submitting this request,

I am marking this issue as p2, which means that we are unable to work on this immediately.

We use +1s to help prioritize our work, and are happy to revaluate this issue based on community feedback. You can reach out to the cdk.dev community on Slack to solicit support for reprioritization.

Check out our contributing guide if you're interested in contributing yourself - there's a low chance the team will be able to address this soon but we'd be happy to review a PR 🙂