API Server frontend LB port should not change backend port

[devigned]

/kind feature

The LB exposed port for the API Server should be configurable on its own without affecting the backend port the LB directs traffic to in the backend pool. For example, the LB for API Server is exposed on 443, but the backend pool is serving traffic on 6443.

Anything else you would like to add: [Miscellaneous information that will assist in solving the issue.] See https://github.com/kubernetes-sigs/cluster-api/issues/5517#issuecomment-954725794

[CecileRobertMichon]

prior work: https://github.com/kubernetes-sigs/cluster-api-provider-azure/pull/1207

[CecileRobertMichon]

we should also take a look at work done in the CAPA provider to use the KCP port: https://github.com/kubernetes-sigs/cluster-api-provider-aws/pull/3063

EDIT: I take that back, I don't think that PR is taking the right approach. Added a comment.

[k8s-triage-robot]

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/lifecycle stale

[shysank]

/remove-lifecycle stale

[k8s-triage-robot]

This seems like a use-case that others would run into (wanting to provide additional, optional metadata about an interaction). Wrapping context types to do this does indeed break the coupling between apps (which is based on specific intent/context type pairs) and adding the metadata into context types affects any that you use (including non-standard proprietary types) and does not seem practical.

Hence (as discussed off to the side), what I'd propose is that we extend ContextMetadata so this can contain some additional fields (we wrapped the only field it currently carries, AppIdentifier, in ContextMetadata for exactly this sort of future-proofing). We could then extend other functions with a new optional argument to include that metadata, e.g. broadcast(context: Context): Promise<void>; changes to: broadcast(context: Context, sourceMetadata?: Context): Promise<void>;

raiseIntent(intent: string, context: Context, app?: AppIdentifier): Promise<IntentResolution>; changes to: raiseIntent(intent: string, context: Context, app?: AppIdentifier, sourceMetadata?: Context): Promise<IntentResolution>;

and ContextMetadata changes from:

interface ContextMetadata {
  /** Identifier for the app instance that sent the context and/or intent. 
   *  @experimental 
   */
  readonly source: AppIdentifier;
}

to

interface ContextMetadata {
  /** Identifier for the app instance that sent the context and/or intent. 
   *  @experimental 
   */
  readonly source: AppIdentifier;
  /** Additional optional metadata that an app may choose to send with a broadcast context or raised intent.
   *  For example to provide source information from within the source application (e.g. from which chat room
   *  (in a chat app) or order (in an OMS) did the message originate from.
   *  @experimental
   */
  readonly sourceMetadata: Context;
}

You could then pass in your ChatRoom context as the sourceMetadata.

ContextMetadata/Originating app metadata is currently an optional feature (there is an issue open to consider whether that should be required, see https://github.com/finos/FDC3/issues/735). But it looks like adding this wouldn’t break anything and could make it more useful… The additional §sourceMetadata§ would become available but the interaction is not dependent on it - making it optional.

However, it is an API change so it’d have to happen in an FDC3 2.1…

[jackfrancis]

/remove-lifecycle stale

[CecileRobertMichon]

/help

[k8s-ci-robot]

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[k8s-triage-robot]

The Kubernetes project currently lacks enough contributors to adequately respond to all PRs.

This bot triages PRs according to the following rules:

• After 90d of inactivity, lifecycle/stale is applied
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/lifecycle stale

[CecileRobertMichon]

/remove-lifecycle stale

[xiujuanx]

I would like to help on this issue. /assign xiujuanx