I'll put out another (basic) idea that isn't listed below. If you have access to production logs and metrics, try to model things like page load times, server

I'll put out another (basic) idea that isn't listed below. If you have access to production logs and metrics, try to model things like page load times, server load, network latency, errors/timeout, number of page views/unique visitors. You might hit on unexpected correlations and maybe unknown bugs (e.g. when page X is loaded with input Y, timeouts and server load increase because of a broken SQL request), or insights on the health of the production platform.