This is the number of SMS software inventory records (SINVs) waiting in Software Inventory Processor's input queue the last ...

This is the number of SMS software inventory records (SINVs) waiting in Software Inventory Processor's input queue the last time Software Inventory Processor scanned the queue, minus the SINVs processed since then. When many SINVs are being written to the input queue, this counter is too low until Software Inventory Processor scans the input queue again. SINVs can be Software Inventory Complete records (SICs) or Software Inventory Delta records (SIDs). If there are any SICs enqeued, this counter shows only the number of enqueued SICs. If only SIDs are enqueued, this counters shows the number of enqueued SIDs.