Disk read bytes/s - The lower threshold of free memory. If available memory goes below this value the monitor fails the test.
Disk write bytes/s - The unit of free memory tested. The free memory threshold is specified in this unit.
Queue monitoring
Leave these fields blank to not perform these tests.
Send queue size (mailbox) - Maximum allowed number of messages in the mailbox send queue.
Receive queue size (mailbox) - Maximum allowed number of messages in the mailbox receive queue.
Send queue size (public) - Maximum allowed number of messages in the public send queue.
Receive queue size (public) - Maximum allowed number of messages in the public receive queue.
SMTP categorizer queue length - Maximum number of allowed messages awaiting processing, such as recipient validation, sorting of local or remote delivery and distribution list recipient expansion. Large number of waiting messages in this queue can indicate performance problems in other Exchange components or Active Directory.
Message queued for delivery - Maximum number of messages queued for delivery.
