Container lifecycle hook support in helm chart

[etiennep]

Request

Container lifecycle hook support is needed as an option in the helm chart to handle graceful pod termination when deployed behind an AWS Application Loadbalancer.

Use case

When using Grafana Alloy in a Kubernetes deployment and with an Ingress provisioned by the AWS ALB Ingress controller, it is required that you use a PreStop lifecycle hook. This is needed to pause the termination of the pod/container to allow the ALB to drain its connection before terminating the pod. Otherwise, an early pod termination may lead to 5xx errors being sent to the client.

This can be mitigated by configuring the deregistration delay on the target group (using ingress annotations) and adding a PreStop hook to pause the termination of the pod and allow it to be deregistered from the target group before it gets terminated.

See AWS ALB Controller issue: kubernetes-sigs/aws-load-balancer-controller#1064

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[etiennep]

I can take this issue if someone can assign it to me.

[etiennep]

#1774