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Nidish G 6Nidish G 6 

What all needs to be checked/tested as a Salesforce developer when an Salesforce org gets upgraded due to scheduled maintenance

What all needs to be checked/tested as a Salesforce developer when an Salesforce org gets upgraded due to scheduled maintenance Spring 21
ShirishaShirisha (Salesforce Developers) 
Hi Nidish,

Greetings!

You might need to update the Hard-coded Urls and which are being used in the code or any other integration as suggested here (https://help.salesforce.com/apex/HTViewSolution?urlname=Updating-Hard-Coded-References-FAQ&language=en_US).

Also,Please refer the article (https://help.salesforce.com/articleView?id=000331027&type=1&mode=1) for more details on when you(System Administrator) will get notification and what needs to be updated.

Kindly mark it as best answer if it helps so that it can help others in the future.

Warm Regards,
Shirisha Pathuri
Gordon EngelGordon Engel
Salesforce does a good job of testing the standard functionality. Mostly you need to focus on your custom code. If there was a bug introduced in the new software release, you may find that something you wrote doesn't work anymore. It's difficult to say what needs to be tested, since Salesforce release testing has done a pretty good job of weeding out the obvious or common bugs.

You could review the release notes and look for areas that have been changed in the release. A bug could still be exposed by a change that seems unrelated, so I wouldn't rely on the release notes completely.