Zabbix

.........T [DEV-1486] added the input data validations and the error handling, added the PagerDuty logo and intro

* commit '6acdaec05df21b63d8a3b7d6af83431b3984bfd0':
  .........T [DEV-1486] removed unnecessary validation of input data in PagerDuty Webhook
  .........T [DEV-1486] fixed calling Zabbix.Log() in PagerDuty Webhook
  .........T [DEV-1486] added the input data validations and the error handling, added the PagerDuty logo and intro