Here is the issue, I have faced several times with the issue that standby member has stopped to answer icmp, http, https and ssh requests. Only reboot of a member helps.
In var/log/messages there are only 2 lines wich correlates with the time of that failover
Jun 10 17:10:46 2019 cpfw-msk-2 kernel: [fw4_1];CLUS-220201-2: Starting CUL mode because CPU usage (81%) on the remote member 1 increased above the configured threshold (80%).
Jun 10 17:10:56 2019 cpfw-msk-2 kernel: [fw4_1];CLUS-120202-2: Stopping CUL mode after 10 sec (short CUL timeout), because no member reported CPU usage above the configured threshold (80%) during the last 10 sec.
I have read some articles related to that messages on the CheckMates, however, I wonder do these messages mean a failover? And what is the possible cause?
Meantime, on the both cluster members by means of monitoring blade I do not see any high peaks - the 1st screenshot is the active member, the second is the standby.