for example by bookinfo applications:
productpage\reviews\details\ratings are microservices of bookinfo.
If productpage call details by: http://details.****.com/details/0, and I set a abort httpfault(http status code is set 503), so productpage will receive 503 from details when it calls http://details.****.com/details/0, but, at this time, there is no metric data about this infomation when i query from prometheus.

this case is a normal case？