Memory leak with the sample rate set to 0

[Gibbonator]

Describe the Bug

Using Version:"io.zipkin.finagle2" % "zipkin-finagle-http_2.12" % "21.8.0"

Zipkin is holding onto memory, causing a memory leak and eventual pod kills:

We set the sample rate to 0 with -Dzipkin.initialSampleRate=0 in this environment. Other services in this environment have the exact same configuration but we are not seeing the same issue with them.

My main question really is: Is this a known problem with our current version, that would be fixed by updating to "io.zipkin.finagle2" % "zipkin-finagle-http_2.13" % "22.4.0" ?

Steps to Reproduce

Given we're only seeing this behaviour with one service, I am not able to provide a definitive way to reproduce it.

Expected Behaviour

No memory leak

Thanks