Purdue University's Retired .NET Peer Review App & the Path to Error Monitoring` The story begins with Gradient, a newly launched peer review app at Purdue University in February 2013, which was built using .NET MVC and hosted on campus. The app experienced significant issues due to a large number of students submitting assignments close to the deadline. The team responded by tweaking queries, implementing caching, and redeploying, with some developers working through the weekend to resolve the issue. Although they later replaced Gradient with a new app called Circuit, Sentry error monitoring was instrumental in helping them identify and fix intermittent errors, particularly Redis timeout issues, before building the new app.