As a follow-up to JENKINS-60229.

When users click "Check now" update sites are not only checked for plugin metadata but also for the tool install metadata.

Each tool has a separate file with its metadata. There can also be multiple update sites. However, there appears to be only a single error message if something goes wrong.

If any of the tool metadata files have a problem with the signature, e.g. Allure plugin's tool as in JENKINS-60229, a user gets a message:

"There were errors checking the update sites: None of the tool installer metadata passed the signature check"

This sounds like the whole transaction failed. If I understand correctly, in fact, the plugin's metadata is updated, and tool metadata is updated but partially up to the failed one. Please correct me if I am wrong.

It would be great if a user could get more details about the whole process and see status and errors per update site. Similar to plugin installation/update page.