Chart: Configure appProtocol case.

[hau21um]

What this PR does / why we need it:

• in GKE with GatewayAPI service port appProtocol have to be uppercase .
• With GKE semverCompare for k8s version was not workig, appProtocol was always omited. Some similar cases:
  -- https://codeengineered.com/blog/2022/helm-kubeversion-gke/
  -- Capabilities.KubeVersion -> string comparison instead of semver helm/helm#3801

With this change you can optionally switch the values to uppercase.
If no changes in value file, then will chart will be rendered with lowercase as before.

Types of changes

• Bug fix (non-breaking change which fixes an issue)
• New feature (non-breaking change which adds functionality)
• CVE Report (Scanner found CVE and adding report)
• Breaking change (fix or feature that would cause existing functionality to change)
• Documentation only

Which issue/s this PR fixes

How Has This Been Tested?

• clone changes locally
• helm install, helm upgrade to GKE cluster

Checklist:

• My change requires a change to the documentation.
• I have updated the documentation accordingly.
• I've read the CONTRIBUTION guide
• I have added unit and/or e2e tests to cover my changes.
• All new and existing tests passed.

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The committers listed above are authorized under a signed CLA.

• ✅ login: hau21um / name: Milos Hauser (904bd55, 318667f, c136dda, 7fffd88, 7d77d33, 2fbfdc6, 017c5d9)

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• ✅ login: hau21um / name: Milos Hauser (6f63c87139db20157f271a5075a3329693f83d98, 3902a9120a2d4b5ddbc1d9c96d5d07966a389b9f, eb49b99dc3093e0a938c2ac6fa3bb251e1f608ba, 3119737655c35e170f86557764809e930b3ee68e, 3df0f982d7ff7afcfe601fbb4e9d9ed56df7721e, 7fc28a55d006a75ae0869ad1fe5454fa401c876b)
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[Gacko]

I did not review the functional changes, yet. But please do not bump the version in the Chart.yaml on your own. Thank you!

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/remove-lifecycle frozen

[Gacko]

/assign

[Gacko]

/retitle Chart: Configure appProtocol case.

[Gacko]

While thinking about that, I'd rather make the appProtocol configurable on a port basis and default to http and https for the HTTP and HTTPS port. So if one needs to override them with HTTPS or YetAnotherProviderSpecificName they can still do so.

[Gacko]

By the way, I don't want to be petty, but the docs are kind of clear on that: https://kubernetes.io/docs/concepts/services-networking/service/#application-protocol

This field follows standard Kubernetes label syntax. Valid values are one of:

• IANA standard service names.
• Implementation-defined prefixed names such as mycompany.com/my-custom-protocol.
• Kubernetes-defined prefixed names:

...

The IANA standard service names list HTTP and HTTPS as http and https. So maybe one should rather file an issue at GKE. 😈

[Gacko]

Can you please elaborate on how you want to implement Gateway API using Ingress NGINX? From how I understand the docs, the Gateway API controller already is an implementation of the Gateway API which comes with all the L7 features. So it's "on the same level" as Ingress NGINX and I don't understand why you want to front Ingress NGINX by a Gateway API Controller. Shouldn't you front your services by the GKE Gateway API Controller directly?

[hau21um]

• fully support "ppProtocol configurable on a port basis and default to http and https for the HTTP and HTTPS port. So if one needs to override them with HTTPS or YetAnotherProviderSpecificName they can still do so.". This should also enable implementation-defined prefixed and Kubernetes-defined prefixed names.
  Actually I was on similar PR with other helm chart. But for ingress-nginx chart was not sure how to achieve same with current code. I can try to rewrite this PR in this direction when will have some free time.

• I gave a feedback to gcp that this uppercase/lower case is not good, but they probably want to align it with the protocol format of spec.ports[].protocol, which is uppercase. Grrr. I did not even found any GitHub project with their "GKE Gateway Controller" to file proper issue.

• I do not have intention on implementing Gateway API using Ingress NGINX. We just have a use case where Gateway API implementation we have is not enough, so we use LB->Gateway->OurBackendService by default and for this one special use case we do LB->Gateway->ingress-nginx->OurBackendService.

[Gacko]

Yes, I got you don't want to implement Gateway API using Ingress NGINX and are simple backing your Gateway API implementation by Ingress NGINX (so Ingress API) for at least one use case. That's what surprised me... but as long as we make the actual appProtocol configurable and still default to http and https, I don't think we need to care.

The appProtocol is a provider specific value by definition and we are just lucky http and https was good enough so far.

[Gacko]

I will finish my work on the chart CI and propose a PR for this asap.