To add to what others have said while trying and failing to be technical about it. This is normal. The web browser is saying this because it has no way to tell if the site you are trying to go to is the real site or has been faked in some way. So this warning just means you need to make sure on your own that what you are connecting to is what you think you are connecting to. When going to a site out on the... Source: over 1 year ago

Do you have any error reporting? Something like Sentry or Google's error reporting. Direct customer feedback can be great, but it often doesn't paint the full picture and doesn't give you technical details that help narrow down the issue. At the very least, you should be asking your customers who are providing feedback to tell you which browser and operating system they are using—a lot of the time this is enough... Source: over 1 year ago

Yup use Cloud Console Error Reporting to get an email blast about all errors in the project. Https://cloud.google.com/error-reporting. Source: about 2 years ago