Zabbix

.........T [ZBXNEXT-9034] added Jira Datacenter by JMX template

Merge in ZBX/zabbix from feature/ZBXNEXT-9034-6.4 to release/6.4

* commit 'bb0c3f49e583a65630dfe95991b63fedd657c315':
  .........T [ZBXNEXT-9034] fixed mail graph in jira data center by jmx template
  .........T [ZBXNEXT-9034] fixed item name in jira data center template
  .........T [ZBXNEXT-9034] fixed changelog
  .........T [ZBXNEXT-9034] added Jira Datacenter by JMX template