chore(elasticloadbalancingv2): specific 5XX CloudWatch metrics for ALB

[sakurai-ryo]

Reason for this change

ALB supports metrics for specific load balancer generated 5XX level error metrics.
https://docs.aws.amazon.com/elasticloadbalancing/latest/application/load-balancer-cloudwatch-metrics.html

However, they are currently not included in HttpCodeElb, so the metrics.httpCodeElb method is not available and metrics.custom must be used.

let alb: IApplicationLoadBalancer;
alb.metrics.httpCodeElb(HttpCodeElb.ELB_5XX_COUNT); // we can do this
alb.metrics.httpCodeElb(HttpCodeElb.ELB_500_COUNT); // currently we cannot do this
alb.metrics.custom("HTTPCode_ELB_500_Count");

Adding the metric names to HttpCodeElb makes it easier to understand as it can be configured in the same way as HTTPCode_ELB_5XX_Count.

Description of changes

Add metrics names to HttpCodeElb.

Description of how you validated changes

Checklist

• My code adheres to the CONTRIBUTING GUIDE and DESIGN GUIDELINES

---

By submitting this pull request, I confirm that my contribution is made under the terms of the Apache-2.0 license

[paulhcsun]

Thanks for adding these @sakurai-ryo! Could you add some test cases as well?

[mergify]

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Pull request has been modified.

[sakurai-ryo]

@paulhcsun
Thanks for your review!
I added the unit test.

[paulhcsun]

Nice work, thanks @sakurai-ryo!

And thanks for the review @go-to-k!

[paulhcsun]

@Mergifyio update

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[paulhcsun]

@Mergifyio update

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Pull request has been modified.

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[paulhcsun]

@Mergifyio update

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Pull request has been modified.

[paulhcsun]

@Mergifyio update

[mergify]

update

☑️ Nothing to do

• #commits-behind>0 [📌 update requirement]
• -closed [📌 update requirement]
• -conflict [📌 update requirement]
• queue-position=-1 [📌 update requirement]

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