i have client that needs to see Matrix log in order to check time of events and which cameras trigger. there is a way to get the Matrix log?

The audit logs does not include matrix but will mention every camera watched, so I think it can be useful.

If you discover they can be useful I recommend that you see this thread - https://mymilestone.force.com/developer/s/question/0D50O00003k9ggOSAQ/how-to-get-audit-logs-from-milestone-server