Zabbix upgrade 3.4.x to 4.0.7 - Mysql traffic raise a lot

[andrea.consadori]

Hi folks,

after updating zabbix server the traffic was always the same, it started to increase by updating the proxies


but mysql select are always the same



Any idea?

no config change after upgrade,
i've only raised offline retention in proxy to 12hours before upgrade to keep local data during zabbix server db upgrade that takes 6 hours.

[andrea.consadori]

is seems related to Zabbix value cache working in low memory mode
i raise the value and the mysql traffic back to 8mb