Added health checks and monitoring to optional installation

[daviftorres]

Documentation page https://docs.cloudstack.apache.org/en/4.20.0.0/installguide/optional_installation.html

The feature exists for years and does work well. Does not offer a huge amount of refined metrics but provides a great visibility of the orchestration utilization.

Added:

• Instructions to enable the feature and its parameters plus limitations.
• Example of configuration for Prometheus.

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📚 Documentation preview 📚: https://cloudstack-documentation--496.org.readthedocs.build/en/496/

[Pearl1594]

Is this documentation relevant for 4.19 and 4.20 as well? If so, could you please raise this PR against 4.19 or 4.20? Thanks

[daviftorres]

Is this documentation relevant for 4.19 and 4.20 as well? If so, could you please raise this PR against 4.19 or 4.20? Thanks

Hey Pearl1594, I did not test on CS 4.19 but the change works around the new version of UFW in Ubuntu 24.04, not related to the version of CS.

If you think it make sense, I can open a PR to add the same notes to the 4.19.

[DaanHoogland]

@daviftorres , I think @Pearl1594 is just suggesting. 21 should come out in september or so, so it is not vital.

[DaanHoogland]

@Pearl1594 , are you alright with these changes?

[Pearl1594]

small comment, otherwise lgtm.

[sureshanaparti]

@blueorangutan docbuild

[blueorangutan]

@sureshanaparti a Jenkins job has been kicked to build the document. I'll keep you posted as I make progress.

[blueorangutan]

QA-Doc build preview: https://qa.cloudstack.cloud/builds/docs-build/pr/496. (QA-JID 407)