Add monitoring of poison queues via Custom Checks

[SzymonPobiega]

Related to:

• Ensure bridge recoverability is compatible with ServiceControl  #276
• Add monitoring of Platform queues in the Monitoring view of ServicePulse ServiceControl#4694

Describe the suggested improvement

Is your improvement related to a problem? Please describe.

When messages are moved to the bridge error queue these messages are dead-lettered and currently require manual intervention by an administrator to move and retry the message.

Describe the suggested solution

Ideally these queues should be processed by ServiceControl. In addition to that, it would be great if Bridge was reporting, via the Custom Check mechanism the length of these queues to ServiceControl.

Describe alternatives you've considered