Zabbix

........S. [ZBX-21761] added HA manager timeout checks and restart in standby mode

Merge in ZBX/zabbix from feature/ZBX-21761-6.0 to release/6.0

* commit 'c5a2563a9b8f315318be957cdee4234a4dcb2799':
  ........S. [ZBX-21761] fixed same node becoming active after switching to standby
  ........S. [ZBX-21761] improved HA timeout handling
  .D........ [ZBX-21761] added changelog entry
  ........S. [ZBX-21761] added HA manager timeout checking and restarting in standby mode
  ........S. [ZBX-21761] added dbclose on failed begin