The "ManagedEvents" metadata tag allows you to flag an event as being managed. By definition this "ManagedEvents" metadata tag should be used in pair with an "Event" metadata tag.
== Noncompliant Code Example
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[Event(name="message", type="my.package.MyEvemt")]
[ManagedEvents("mes")] //This "mes" event is not defined with the "Event" metadata tag
public class MyClass {...}
== Compliant Solution
[ManagedEvents("message")]