Glad to hear you were able to resolve your issue @Jemali Vashakmadze. My apologies for not being clear about the list of detectors. Under Availability and Performance, there are a list of detectors that can help provide detail.
From what you've described, sounds like you had a runtime compile error for your function endpoint. An issue like that should have shown up under the Functions that are not triggered or Function App Down or Reporting Errors detectors.
This isn't always the case as it could've also been a deployment error of some kind, in which the detectors under Configuration and Management could be helpful.