CPU Consumption not decreasing

Dear Community,

First of all, many thanks for jitsi community for the lot of information we can have.

We are running jist-meet on Debian 10 with the following version :
icofo 1.0-636-1
jitsi-meet-prosody 1.0.4428-1
jitsi-meet-turnserver 1.0.4428-1
jitsi-meet-web-config 1.0.4428-1
jitsi-meet-web 1.0.4428-1
jitsi-meet 2.0.5076-1
jitsi-videobridge2 2.1-351-g0bfaac1c-1

Everything is running perfectly but we notice one things.
Our jitsi instance is monitored using Zabbix and Grafana. And we have the impression that when no more room are available, CPU consumption is not decreasing.
using top command line, we saw JVB seems using the CPU :

If I look at grafana, it say CPU consumption always increase

I didn’t yet restart the server or the jicofo service

Did we miss something during the setup ? ( Standard Jitsi-Meet Install )

Many thanks for your help