FR: Configurable Services/Deployments for EventListener Sinks

[dibyom]

Expected Behavior

A user should have more control over their EventListener sink. Today the only option we provide is the serviceType. Users might want to control the number of replicas for their deployments, loadBalancerIPs etc.

Actual Behavior

We don't provide a declarative way for users to configure any of these. Users may modify the created sink objects directly but we do not provide any guarantees that the EL reconciler will not overwrite the user changes

Additional Info

1. Some related discussion in Reducing the pods related to EventListener #370
2. An alternative to explore - instead of adding more configuration for the users, add different modes of deployments e.g. deploy the EL sink as a knative service instead

[akihikokuroda]

The requirement for the service is already covered but here is information for EKS configuration: https://github.com/tektoncd/experimental/blob/master/webhooks-extension/docs/GettingStarted.md#notes-for-amazon-eks

[dibyom]

Closing in favor of #505
/triage duplicate
/close

[tekton-robot]

@dibyom: Closing this issue.

In response to this:

Closing in favor of #505
/triage duplicate
/close

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