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books
2021
Liefting - Zabbix 5 IT Infrastructure Monitoring Cookbook
    3189E3C519E7CF3B54086D9AE8855017

whatsnew
https://www.zabbix.com/whats_new_5_4
    https://linuxiac.com/zabbix-5-4-release-comes-with-scheduled-pdf-report-generation/