Log name of class that failed to obtain exclusive lease

app/services/concerns/exclusive_lease_guard.rb

@@ -21,7 +21,7 @@ module ExclusiveLeaseGuard
     lease = exclusive_lease.try_obtain
 
     unless lease
-      log_error('Cannot obtain an exclusive lease. There must be another instance already in execution.')
+      log_error("Cannot obtain an exclusive lease for #{self.class.name}. There must be another instance already in execution.")
       return
     end