Http_requests_total not available

Hi our ask is to monitor the most popular services based on the api calls made to them . for this our services are not exposing http_requests_total metric .
our services are microservices in AKS . are using Prometheus as data source and grafana as visualtion tool . and the services are being scraped by Prometheus via service monitors.
so now how should i find a go around for this .
and unfortunately being a devops engineer i don’t have access to source code of the services