Enable Karpenter interruption handling

[alan-walsh]

Summary

• Configure the cluster-level chart to load Karpenter values from this GitOps repo.
• Enable Karpenter interruption handling with the existing ardac1prd-ardac1prd SQS queue.
• Exclude medium instances from the default Karpenter NodePool in addition to nano, micro, and small.
• Scale ambassador, aws-es-proxy, fence, portal, and revproxy to 3 replicas.

AWS change already applied

• Updated IAM policy arn:aws:iam::742378880825:policy/ardac1prd-karpenter-sa-policy to default version v2.
• The Karpenter2 SQS statement now grants receive/delete/get permissions on arn:aws:sqs:us-east-1:742378880825:ardac1prd-ardac1prd.
• Previous policy document backup was saved locally at %TEMP%\ardac1prd-karpenter-sa-policy-v1-backup.json.

Validation

• helm template cluster-level-resources gen3/cluster-level-resources -f ardac1prd\cluster-level-resources\cluster-values.yaml
• helm template gen3 gen3/gen3 -f ardac1prd\portal.ardac.org\values.yaml
• helm template karpenter oci://public.ecr.aws/karpenter/karpenter --version 1.0.8 -f ardac1prd\cluster-values\karpenter.yaml
• git diff --check

[Copilot]

Pull request overview

Enables Karpenter interruption handling for the ardac1prd cluster by introducing Karpenter Helm values in this GitOps repo and wiring cluster-level resources to load that configuration, while also adjusting default Karpenter instance-size constraints and scaling key Gen3 services to 3 replicas.

Changes:

• Scale ambassador, aws-es-proxy, fence, portal, and revproxy to replicaCount: 3 in portal.ardac.org values.
• Add ardac1prd/cluster-values/karpenter.yaml with Karpenter settings including interruptionQueue.
• Update cluster-level resources values to enable Karpenter configuration loading and exclude medium instance sizes in the default NodePool requirements.

Reviewed changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 2 comments.

File	Description
ardac1prd/portal.ardac.org/values.yaml	Increases replica counts for several services to improve availability/capacity.
ardac1prd/cluster-values/karpenter.yaml	Adds Karpenter Helm values including IRSA annotation, cluster settings, and interruption queue.
ardac1prd/cluster-level-resources/cluster-values.yaml	Enables Karpenter configuration loading from this repo and updates default instance-size exclusions.

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