This read-only value reports the policy the queue uses to decide which frames to drop when it needs to shed load, such as tail-drop or a weighted random-early-detection style policy. An admin checks this to understand how a congested queue will behave, which matters when diagnosing why certain traffic is being dropped under load. For example, a queue configured with a tail-drop discard policy will drop newly arriving frames once full, rather than proactively dropping some traffic earlier as a RED-style policy would.