Hello

The plugin is not meant to be compatible out of the box with all features and plugins of Jenkins, so I consider this requirement as an Improvement rather than a Bug .

It would indeed be interesting to make the plugin able to gather data from Clouds' definitions.
As you suspected however there is very little data available to the plugin via generic Jenkins APIs. In fact I can see only one relevant function, canProvision(Label) which could be used to detect if a Label defined by a job is also supported by a Cloud, and to determine whether a job cannot be executed at all because no fixed slaves nor Clouds support it.
Note that this generic Jenkins API works only at the Cloud level, it doesn't allow granularity at template's level, which may be a concept specific to the Docker plugin.

Considering this, what would you suggest for the dashboard?

Note: I took the liberty to change this issue name & type, and I cross-referenced it in the plugin page.

You are correct, this really is a feature - not a bug.

I'm not sure if this would work, but perhaps for every label or combination of labels that the Linked Jobs plugin is processing, it could do a canProvision() on that label against each Cloud instance that's currently registered in Jenkins. If a Cloud responds affirmative, then the dashboard could just note the Clouds that support that combination. The dashboard wouldn't be able to tell how many nodes would support the label combination in that particular Cloud, but it would at least know that it can be handled.

This logic could be used to determine if orphan jobs (jobs that have no runnable node) are really orphans or if some cloud can support them.

It seems technically doable.

https://github.com/jenkinsci/label-linked-jobs-plugin/commits/feature/JENKINS-32445

jswager1, do you have a sandbox instance of jenkins where you could test a new version of the plugin with realistic clouds settings?
Since I don't use clouds, my test cases may be missing some settings that occur in "production" environments. Let me know if you have the possibility to test a dev/snapshot version of the plugin, and I'll upload it to jenkins plugins snapshot repository.

I added two things that are visible:

• on the labels dashboard, if there is at least one cloud defined in the Jenkins instance, each label has an indication to give the number of clouds which can provision it (see screenshot)
• on the labels linked jobs, cloud(s) able to provision each label listed (atomic or composite) is/are listed (see screenshot)

Provisioning clouds are also taken into account to determine the list of orphaned jobs on the dashboard.

A snapshot plugin version with this new feature is available there.