[PudgePacket]

Could you purge conditionally? Eg Purge where message importance < critical.

[sudhirj]

Depends on the particular system you’re using. Some might allow it, or you could do it with a script if you really wanted to.

[dastbe]

you’d have to build that into your system, or build a synchronous system in front of you queue to provide these semantics. and does critical imply time sensitivity, necessity of delivery, or both?