Refactoring: code formatting and add functions descriptions and some comments.
Refactoring: code formatting and add functions descriptions and some comments.

alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,alexanderzobnin/grafana-zabbix,xiaohuiz/grafana-zabbix,xiaohuiz/grafana-zabbix