Why Is a GitLab Webhook That Integrates with Jenkins Failing with a “500 …instance_identity.InstanceIdentity.get …” error?

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Problem scenario
A GitLab webhook (aka integration) fails.  It used to work as an integration mechanism with Jenkins.  The GitLab error message says:

"500 <!DOCTYPE html> ... at org.jenkinsci.main.modules.instance_identity.InstanceIdentity.get(InstanceIdentity.java:133)"

Solution
Go to the Jenkins server and reinstall the GitLab plugins.

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