Add slow-consumer detection on outgoing links based on address-specific configuration and link metrics. The following attributes shall be added to the address configuration:

• slowConsumerRate - This optional attribute, if present, shall enable slow-consumer detection for consumers using the configured address (pattern or prefix).
• slowConsumerBacklog - (defaults to 10) This attribute works with slowConsumerRate to enable slow-consumer detection.

When enabled for an address, slow consumer detection shall operate as follows: If the backlog of unsettled deliveries (undelivered + unsettled) for an outgoing link to an endpoint exceeds slowConsumerBacklog and the five-second average rate of that link is less than or equal to slowConsumerRate, then the link shall be flagged as "slow".

Slow-link status may be queried per link. There shall also be a global counter for the number of links that are currently in "slow" state. Log events shall be emitted to notify of the existence of slow links.