As its name implies, a ruleset is a set of rules that tells us which events you want to be alerted on. Go to Configuration > Rulesets to tell us which events you want to be alerted on. You can monitor changes to hosts, vulnerabilities, tickets, ports and certificates.
It's easy. Choose a rule type on the left and drag it to the right, then set the rule criteria. Be as specific as you want when setting rule criteria. For example, you may want to be notified for all new vulnerabilities or only new vulnerabilities on Windows hosts with a patch available.
AND is used within a rule. For example, get an alert for a vulnerability that matches: New, Reopened status AND severity 5 AND has a patch.
OR is used between multiple rules. For example, get an alert for a newly opened port OR expired certificate OR new host.
Check out these examples to get some ideas:
Sample 1 - PCI vulnerabilities
Sample 2 - Expired certificates
Sample 3 - Open ports on Linux hosts
Sample 4 - FTP running on non-standard port
Manage Your Rulesets | View Your Alerts | Threat Protection RTI