[JENKINS-43786] Adapted the administrative monitor to the new UI definition

[recena]

JENKINS-43786

Downstream of jenkinsci/jenkins#2857

Screenshot

@jenkinsci/code-reviewers

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This change is 

[recena]

@lanwen Thanks for your feedback. This PR has a drawback, it will require to bump the core version to the version where this PR jenkinsci/jenkins#2857 is merged.

[lanwen]

@recena this is too huge change for this plugin...

[KostyaSha]

@lanwen Thanks for your feedback. This PR has a drawback, it will require to bump the core version to the version where this PR jenkinsci/jenkins#2857 is merged.

Bad.

[recena]

@lanwen Agree. You can apply these changes in midterm. This depends on changes in Jenkins. What I would like is to get those changes in core as soon as possible, and in this way, maintainers could adapt their plugins when they decide.

[recena]

@KostyaSha Again I agree. I tried to share the pros / cons.

[lanwen]

How would it look if I merge it now?

[lanwen]

So it just changes the position of text in old versions

[recena]

@lanwen I've worked on a more robust solution. You can see an example here jenkinsci/ssh-agents-plugin#70. Maintainers will be able to use the benefits of jenkinsci/jenkins#2857 without side-effects in previous versions.

You screenshot is showing a side-effect until the baseline of this plugin is updated.