Zabbix

...G...... [ZBX-21859] fixed active checks sometimes not being executed on Zabbix agent2 if checks for plugin have long and short update intervals

Merge in ZBX/zabbix from feature/ZBX-21859-6.4 to master

* commit '523d28754fe7269cc6fda2a660a39f5ae4ed6fd2':
  .D........ [ZBX-21859] added ChangeLog entry
  ...G...... [ZBX-21859] fixed active checks sometimes not being executed on Zabbix agent2 if checks for plugin have long and short update intervals

(cherry picked from commit f3a5b48d176b7fdc9f1b00654465811b378fe67b)
(cherry picked from commit 8d691b1de50da840582b0b7a9ef550f1a19fa0fa)
(cherry picked from commit 90dbf43d7974943e1f02e1d14082ec95545b81c1)