This object sets a limit on how many SNMP INFORM notification packets can be outstanding, awaiting acknowledgment, at the same time; once an inform's response arrives matching its request-id it's discarded immediately, otherwise the device retries per the standard SNMP target retry and timeout settings until giving up. An admin tunes this to control how much queue capacity is devoted to reliable trap delivery, raising it in busy networks generating many simultaneous alarms so informs aren't dropped before they can be retried. For example, leaving the default of 39 means up to 39 unacknowledged INFORM messages can be queued for retry at once before older ones are discarded to make room.