Issue

• A plugin update should be available but it isn’t.
• The Update Center information is updated into the $JENKINS_HOME but not reflected
  in the available plugin updated.
• Bug referenced as CORE-389.

Environment

• CloudBees Jenkins Enterprise - Managed Master (CJE-MM) 2.121.2.1
• CloudBees Jenkins Enterprise - Operations Center (CJE-OC) 2.121.2.1
• CloudBees Jenkins Team (CJT) 2.121.2.1
• CloudBees Jenkins Platform - Client Master (CJP-CM) 2.121.2.1
• CloudBees Jenkins Platform - Operations Center (CJP-OC) 2.121.2.1
• CloudBees CI (CloudBees Core) on modern cloud platforms - Managed Master (CORE-MM)
• CloudBees CI (CloudBees Core) on modern cloud platforms - Operations Center (CORE-CLOUD-OC)
• CloudBees CI (CloudBees Core) on traditional platforms - Client Master (CORE-CM)
• CloudBees CI (CloudBees Core) on traditional platforms - Operations Center (CORE-OC)

The Update Center information is actually downloaded but the previous information is cached,
so the obtained data is not the latest one.

To invalidate such cache and make the updated data to be retrieved, the following
Groovy script can be used through the Script console:

Jenkins.get().getUpdateCenter().doInvalidateData()