If you want to give Fusion a shot, we can help you set it up: https://www.nagios.com/services/quickst ... os-fusion/
If you want to read through some documentation first, you can find it at https://library.nagios.com/library/prod ... mentation/
You can demo the software at http://nagiosfusion.demos.nagios.com/
Fusion is not the only way to do this, but we've already given you some options. Did you watch the two videos we gave you?
I did a brief search to see if I could find any resources in Greek, but I could not. Of course, my search term "mod_gearman" is not in Greek characters, so I am sure that hurt my search.