message property
Message is the engine's own sentence about this object — the apiserver's refusal on a failure, and typically empty on success. It is for a human reading a failed run, not a value to branch on.
Please note: This property should have been non-nullable! Since the specification file does not include a default value (using the "default:" property), however, the generated source code must fall back to having a nullable type. Consider adding a "default:" property in the specification file to hide this note.
Implementation
String? message;