Ideas on reporting based on SLAs

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Hi all

So was hoping someone here has gone through figuring out what data can help determine uptimes of devices and specific ports to basically help report whether or not a service provider is currently within SLA? Is this something that can be done with data from DB? If so, which tables etc.? Do I need alerts? Any help would really go a long way. I don’t want to reinvent the wheel here.

Regards

Hans