The alert system lives on two screens that do opposite halves of the job.
Rule Studio - the control panel. Every rule lives here as a card, grouped by tier. Toggle a rule on or off with the switch on its top-right corner, and click Adjust to tune its settings. This is where you decide what to watch for.
Insights - the results screen. Every alert that fired, listed and charted, with severity, the account and resource involved, and an acknowledgement workflow. This is where you see what was found.
Open Rule Studio and find the rule's card.
Click Adjust - the card expands to reveal sliders (for numeric thresholds) and switches (for what counts as a trigger).
As you drag a slider, the rule's plain-English sentence rewrites itself live, so you feel the change before you commit.
Hit Save changes - the new settings take effect on the next check.