spark-operator: Document how to monitor with jmx and prometheus

[fjammes]

Checklist:

• [ X] You have signed off your commits
• [ X] Ensure you follow best practices from our guide. Contributing.
• [] You have included screenshots when changing the website style or adding a new page.
  (not able to locally build the website because of below error:
  $ hugo server -D
  Error: html/template:_partials/head.html:73:16: no such template "_internal/google_analytics_async.html"
  $ hugo version
  hugo v0.147.1+extended+withdeploy linux/amd64 BuildDate=unknown
  )

Description of your changes: Document how to setup spark monitoring with JMX and Prometheus

Labels

/area spark-operator

/area website

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[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[google-oss-prow]

Hi @fjammes. Thanks for your PR.

I'm waiting for a kubeflow member to verify that this patch is reasonable to test. If it is, they should reply with /ok-to-test on its own line. Until that is done, I will not automatically test new commits in this PR, but the usual testing commands by org members will still work. Regular contributors should join the org to skip this step.

Once the patch is verified, the new status will be reflected by the ok-to-test label.

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Instructions for interacting with me using PR comments are available here. If you have questions or suggestions related to my behavior, please file an issue against the kubernetes/test-infra repository.

[Arhell]

/ok-to-test