Communication about communication is called

Communication about communication is called metacommunication.

It refers to the messages, often non-verbal, that tell the receiver how to interpret the messages being sent, framing tone, intent and relationship.

A raised eyebrow, a change in tone or a comment on how something was said all operate at this level above the primary message.

A communication narrative simply means a story told through communication and does not denote messaging about messaging.

A communication cascade describes the spreading flow of a message through many people, not commentary upon the message itself.

Metacognition means thinking about one's own thinking, a mental self-monitoring, which is distinct from communicating about communication.