feat(metrics-server): add dnsConfig support

[mkamadeus]

Changes

This PR adds support for configuring DNS settings specifically for the KEDA metrics server pod through the new metricsServer.dnsConfig parameter in values.yaml.

Usage Example

metricsServer:
  dnsConfig:
    nameservers:
      - "8.8.8.8"
      - "1.1.1.1"
    searches:
      - "metrics.example.com"
    options:
      - name: "ndots"
        value: "3"

Checklist

• I have verified that my change is according to the deprecations & breaking changes policy
• Commits are signed with Developer Certificate of Origin (DCO - learn more)
• README is updated with new configuration values (if applicable) learn more
• A PR is opened to update KEDA core (repo) (if applicable, ie. when deployment manifests are modified)

[wozniakjan]

lgtm

[Copilot]

Pull Request Overview

This PR adds DNS configuration support for the KEDA metrics server component by introducing a new metricsServer.dnsConfig parameter. This enhancement allows users to customize DNS settings specifically for the metrics server pod, providing more flexibility in DNS resolution scenarios.

Key changes:

• Added metricsServer.dnsConfig configuration option to values.yaml with example usage
• Updated the metrics server deployment template to conditionally include DNS configuration
• Updated documentation to reflect the new configuration parameter

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated 1 comment.

File	Description
keda/values.yaml	Adds the new dnsConfig parameter with commented examples for nameservers, searches, and options
keda/templates/metrics-server/deployment.yaml	Conditionally renders the dnsConfig section in the pod spec when the parameter is provided
keda/README.md	Documents the new metricsServer.dnsConfig parameter in the configuration table