Toby Clemson's infodeck on Martin Fowler's site has a lot of information about testing microservices: https://martinfowler.com/articles/microservice-testing/
"Testing in production" doesn't necessarily mean "Test only in production". Cindy Sridharan has a nice article about the nuances involved: https://copyconstruct.medium.com/testing-in-production-the-s...