@Samar Elsayed
1. Yes, application refers to a single service
2. So, in this case you want to know which service a particular end point belongs to?
You can see that from the Traces page. Just select only the endpoint you want in the operations facet, and you will see the spans in the right side with the corresponding spans along with service names
SigNoz is an open-source APM. It helps developers monitor their applications & troubleshoot problems, an open-source alternative to DataDog, NewRelic, etc.