(Service Check Timed Out) in RAW edition 1.6.0p11 (centOS 8)

Last alert :

Host switch-stack2-2eme(switch-stack2-2eme)
Service Check_MK
Event CRITICAL → OK
Address 192.168.254.242
Date / Time Wed May 20 20:49:56 CEST 2020
Plugin Output OK - [snmp] Success, execution time 31.8 sec
Additional Output
Host Metrics rta=3.950ms;15000.000;30000.000;0; pl=0%;80;100;; rtmax=9.051ms;;;; rtmin=1.404ms;;;;
Service Metrics execution_time=31.751 user_time=0.070 system_time=0.050 children_user_time=0.080 children_system_time=0.130 cmk_time_snmp=31.417 cmk_time_agent=0.000