Hongten

hmm, I double-check the pulsar(broker) lib folder and find the `io.prometheus-simpleclient` is 0.5.0. ``` ~ ll | grep prometheus -rwxrwxrwx 1 root root 59175 Jan 22 2020 io.prometheus-simpleclient-0.5.0.jar* -rwxrwxrwx 1...

After I have upgraded(I cherry-pick the code from this MR - https://github.com/apache/pulsar/pull/13785) the Prometheus client version from 0.5.0 to 0.15.0, the CPU usage still exceeds 30 and the Prometheus-related code...

Summary: Upgrade the Prometheus version to 0.16.0 in both Pulsar and KoP. The performance can be improved by around 37%. After upgrading the Prometheus version to 0.16.0 in both Pulsar...

Summary: The KoP-related code CPU usage can improve by around 10.75% if we set `entryFormat=kafka`(The default `entryFormat=pulsar`.) [entryFormat.flame_graph.zip](https://github.com/streamnative/kop/files/10408755/entryFormat.flame_graph.zip) P1 - `entryFormat=pulsar`, the kop-related code CPU usage is around 50.37%. Almost...