Support for readiness probe options for pilot in the helm chart

[brettcurtis]

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Describe the feature request
I see readiness probe options in the values for:

global:
   proxy:
      readinessPeriodSeconds: 2

I'd like to change the readiness probe values for the istiod deployment tho, am I missing something here? The reason I'm looking for this is because I'm trying to to use GKE multi-cluster-services and export the istiod service and Google is requiring that the TimeoutSeconds must be less than or equal to PeriodSeconds.

status:
  conditions:
  - lastTransitionTime: "2023-09-26T11:22:11Z"
    status: "True"
    type: Initialized
  - lastTransitionTime: "2023-09-26T21:12:24Z"
    message: '&ServicePort{Name:grpc-xds,Protocol:TCP,Port:15010,TargetPort:{0 15010
      },NodePort:0,AppProtocol:nil,} has error: invalid ReadinessProbe configuration:
      TimeoutSeconds must be less than or equal to PeriodSeconds;&ServicePort{Name:https-webhook,Protocol:TCP,Port:443,TargetPort:{0
      15017 },NodePort:0,AppProtocol:nil,} has error: invalid ReadinessProbe configuration:
      TimeoutSeconds must be less than or equal to PeriodSeconds'
    reason: ReadinessProbeError
    status: "False"
    type: Exported

I don't know if this a standard k8s deploy thing or something MCS is requiring specifically.

Describe alternatives you've considered

Patch deployment or extend chart.

Affected product area (please put an X in all that apply)

[ ] Ambient
[ ] Docs
[ ] Dual Stack
[ X ] Installation
[ ] Networking
[ ] Performance and Scalability
[ ] Extensions and Telemetry
[ ] Security
[ ] Test and Release
[ ] User Experience
[ ] Developer Infrastructure

Affected features (please put an X in all that apply)

[ ] Multi Cluster
[ ] Virtual Machine
[ ] Multi Control Plane

Additional context

[brettcurtis]

Maybe it's fair to just request that the TimeoutSeconds should be less than or equal to PeriodSeconds?

[brettcurtis]

Is this something that might be a good add to the chart or am I misunderstanding the current implementation?

[istio-policy-bot]

🚧 This issue or pull request has been closed due to not having had activity from an Istio team member since 2023-10-11. If you feel this issue or pull request deserves attention, please reopen the issue. Please see this wiki page for more information. Thank you for your contributions.

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