Enumeration for various kinds of backpressure support.
Indicates the backpressure support kind of the associated operator or class.
Indicates the feature is in beta state: it will be most likely stay but
the signature may change between versions without warning.
Marks methods whose return values should be checked.
Indicates the feature is in experimental state: its existence, signature or behavior
might change without warning from one release to the next.
Indicates that a field/parameter/variable/return type is never null.
Indicates that a field/parameter/variable/return type may be null.
Indicates what kind of scheduler the class or method uses.