ALB Health Checks failing when using CloudBees CI with platform EKS

Issue

I have deployed CloudBees CI in EKS with .OperationsCenter.platform="eks" and using the AWS Load Balancer Ingress Controller
The AWS Application Load Balancer shows the targets of Operations Center and Controllers are all Unhealthy although access works as expected

Environment

CloudBees CI (CloudBees Core) on Modern Cloud Platforms < 2.277.4.2
Master Provisioning Plugin < 2.5.28
AWS Load Balancer Controller

Related Issues

BEE-2600: Missing health checks declarations when using ALB ingress controller on EKS

Explanation

CloudBees CI Ingresses are missing the alb.ingress.kubernetes.io/healthcheck-path annotation. This causes all the Application Load Balancer targets to be unhealthy.

In most cases, this is not a critical problem because of the behavior of the AWS Application Load Balancer that forwards the traffic across all unhealthy targets, if they are all unhealthy.

Resolution

Upgrade CloudBees CI to version 2.277.4.2

Workaround

The workaround would be to add the alb.ingress.kubernetes.io/healthcheck-path annotation in both Operations Center and Managed Controllers:

In the Helm values file, add the annotation alb.ingress.kubernetes.io/healthcheck-path: /cjoc/login:

OperationsCenter:
  Ingress:
    Annotations:
      alb.ingress.kubernetes.io/healthcheck-path: /cjoc/login▼

For Managed Controller, in the configuration of the existing Managed Controllers, add the following YAML snippet:

kind: Ingress
metadata:
  annotations:
    alb.ingress.kubernetes.io/healthcheck-path: /${name}/login▼

Then restart the Controllers from Operations Center for the change to take effect.