Hi, I have a monitor running, and I got a 502 (bad gateway), but It shows the running in green and does not send notification emails.
What can I do?
Thanks
Welcome to the Postman Community! 
Do you have tests within that Collection that are checking the status code or any other property of the response that’s important to you?
As an example, this monitor returns a 502 and is Green. There is nothing telling the monitor that this is bad or should be Red.
If I was to add a basic status code check in there to check for a 200 code, this would fail and fail the monitored run.
No ,I do not have tests. In other APIs I do not use them and send me notifications, I will do them, thanks a lot