Throw a fit if the last monitor of a couch_file is not the tracker
diff --git a/src/couch_file.erl b/src/couch_file.erl
index 09b8e3c..afb76a3 100644
--- a/src/couch_file.erl
+++ b/src/couch_file.erl
@@ -585,5 +585,6 @@
     case process_info(self(), monitored_by) of
         {monitored_by, []} -> true;
         {monitored_by, [Tracker]} -> true;
+        {monitored_by, [_]} -> exit(tracker_monitoring_failed);
         _ -> false
     end.