@Nime If you're using the CompositeC1Contrib.ScheduledTasks backage, it will route all Hangfires logs to C1's Server log. If not, you're welcome to copy the code from here
https://bitbucket.org/burningice/compositec1contrib/src/c822c4e7730e8044f73bb877cbc76183a7376e43/ScheduledTasks/OwinExtensions.cs?at=default&fileviewer=file-view-default#OwinExtensions.cs-24
https://bitbucket.org/burningice/compositec1contrib/src/c822c4e7730e8044f73bb877cbc76183a7376e43/ScheduledTasks/C1LogProvider.cs?at=default&fileviewer=file-view-default
https://bitbucket.org/burningice/compositec1contrib/src/c822c4e7730e8044f73bb877cbc76183a7376e43/ScheduledTasks/OwinExtensions.cs?at=default&fileviewer=file-view-default#OwinExtensions.cs-24
https://bitbucket.org/burningice/compositec1contrib/src/c822c4e7730e8044f73bb877cbc76183a7376e43/ScheduledTasks/C1LogProvider.cs?at=default&fileviewer=file-view-default