feat(appmesh): Implement Outlier Detection for Virtual Nodes

[alexbrjo]

This is a pretty short PR adding outlier detection to Virtual Node listeners. See below for usage.

const node = mesh.addVirtualNode('virtual-node', {
  serviceDiscovery: appmesh.ServiceDiscovery.cloudMap({
    service: service,
  }),
  outlierDetection: {
    baseEjectionDuration: cdk.Duration.seconds(10),
    interval: cdk.Duration.seconds(30),
    maxEjectionPercent: 50,
    maxServerErrors: 5,
  },
});

Note:

• All the parameters are required and there aren't any combinations of features that get special treatment, so there's only one unit test.
• We don't do any min/max time evaluation for other features so I followed precedent for that.

issue #11648

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[gitpod-io]

[skinny85]

Looks good @alexbrjo , just one small question.

You wrote in a comment:

// Cloud Map service discovery is currently required for host ejection by outlier detection

I wonder - is this something we want to validate on the CDK side of things, or do you expect this limitation to be lifted soon?

[alexbrjo]

Yeah I considered throwing an error but after discussing with the team decided to leave it out. We have a feature request that would support non-CloudMap outlier detection aws/aws-app-mesh-roadmap#239

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[mergify]

Thank you for contributing! Your pull request will be updated from master and then merged automatically (do not update manually, and be sure to allow changes to be pushed to your fork).