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Nevin O'Regan 3Nevin O'Regan 3 

Where can I see who has removed a trigger from my org

Where can I see information on when a trigger / class was removed from my Org and by who?
Pradeep SinghPradeep Singh
Hi,
You can view this information from "View Setup Audit Trail" option available under Security Controls in Setup.
Setup Audit Trail tracks the recent setup changes that you and other admins have made to your org. 

For more information refer https://help.salesforce.com/articleView?id=admin_monitorsetup.htm&type=5

 
SandhyaSandhya (Salesforce Developers) 
Hi,

You can check in your View Setup Audit Trail 

From Setup, enter View Setup Audit Trail in the Quick Find box, then select View Setup Audit Trail. To download your org’s full setup history for the past 180 days, click Download. After 180 days, setup entity records are deleted.

The history shows the 20 most recent setup changes made to your org. It lists the date of the change, who made it, and what the change was. If a delegate (like an admin or customer support representative) makes a setup change on behalf of an end user, the Delegate User column shows the delegate’s username. For example, if a user grants login access to an admin and the admin makes a setup change, the admin’s username is listed.

Refer below help article.

https://help.salesforce.com/articleView?id=admin_monitorsetup.htm&type=5
 
Please mark it as solved if my reply was helpful. It will make it available for other as the proper solution.
                                             
Best Regards
Sandhya