The process /usr/sbin/zabbix_server: preprocessing manager #1 gradually increases its memory usage over time, reaching around 1.7 GB within ~24 hours, without releasing it.
Memory usage stabilizes near 90% of total system RAM.
Memory is only released after restarting the zabbix-server service.

• On service start → 200–300 MB used

• After several hours → over 1.5 GB used by manager #1 alone

• Other managers and syncers maintain stable memory usage

• PreprocessingWorker=3 in configuration

• LogLevel=4 shows no unusual errors

• zabbix_server -V: Zabbix server (Zabbix) 7.0.0

• OS: Ubuntu 22.04