need to create a Active alerts reports from last 7 days with alertname,Message, TriggeringObject, Activetime and Relatednode
Please find the below screen shot for your reference
There is an OOB report for 'All active alerts' and you can customise it as per your requirements. Also 'Triggered Alerts - Last 30 Days web-based' OOB report can be used and customise according to your requirements.
