@Deprecated(forRemoval = true) // TODO: Remove on Vespa 9
    public DocumentProtocol.Priority getPriority() { return priority; }
Returns the priority tag for this message. This is an optional tag added for VDS that is not interpreted by the
document protocol.

@return The priority.
@deprecated explicit operation priority is deprecated
documentapi/src/main/java/com/yahoo/documentapi/messagebus/protocol/DocumentMessage.java