Zabbix

.......PS. [ZBX-24043] fixed extensive locking when retrieving Server statistics

Merge in ZBX/zabbix from feature/ZBX-24043-6.5 to master

* commit 'a2a31c195bcdeb9a69b458da4df8158aa127efcf':
  .......... [ZBX-24043] added changelog
  .......PS. [ZBX-24043] removed logging under locks
  .......PS. [ZBX-24043] fixed warning
  .......PS. [ZBX-24043] improved logging, changed readlocks
  .......PS. [ZBX-24043] fixed applying concurrently calculated diff
  .......PS. [ZBX-24043] fixed not monitored hosts calculation and removed redundant code
  .......PS. [ZBX-24043] fixed conditions for removal of unchanged proxies, dropped iteration through dc_proxy
  .......PS. [ZBX-24043] fixed comparison of monitored hosts count
  .......PS. [ZBX-24043] removed redundant code
  .......PS. [ZBX-24043] improved diff retrieval and applying process
  .......PS. [ZBX-24043] update last_update only when finished appl
  .......PS. [ZBX-24043] removed unused code
  .......PS. [ZBX-24043] fixed get_host_statistics
  ........S. [ZBX-24043] fixed extensive locking when retrieving status info