When something is added in Sonarr for example, you should be able to see this in your embyserver.txt:
2019-09-21 06:01:28.825 Info HttpServer: HTTP POST http://localhost:8096/mediabrowser/Library/Media/Updated. UserAgent: Sonarr/18.104.22.1684 (fedora 30)
2019-09-21 06:01:28.846 Info HttpServer: HTTP Response 204 to 127.0.0.1. Time: 22ms. http://localhost:8096/mediabrowser/Library/Media/Updated
Or something along those lines if the library is updated.
What do you mean by locally mapped? I point everything to my mergerfs mount so there isn't any mapping that I do.