This Enhancement introduces a configurable link heartbeat interval for the qpidd broker. In a worst-case scenario, the previous heartbeat default of 120 seconds would result in a system recovery under 240 seconds. For High Availability environments, this amount of time was considered to be too long, and a user-configurable time in seconds was required. The qpid broker now has an option `link-heartbeat-interval`, which allows a custom heartbeat interval (in seconds) to be configured. This feature is documented in the "Broker HA Options" section in the Messaging Installation and Configuration Guide.