--- a/cubicweb/sobjects/services.py	Fri Mar 10 16:41:10 2017 +0100
+++ b/cubicweb/sobjects/services.py	Fri Mar 10 12:07:29 2017 +0100
@@ -50,7 +50,6 @@
             results['%s_cache_hit_percent' % title] = (hits * 100) / (hits + misses)
         results['type_cache_size'] = len(repo._type_cache)
         results['sql_no_cache'] = repo.system_source.no_cache
-        results['nb_open_sessions'] = len(repo._sessions)
         results['nb_active_threads'] = threading.activeCount()
         results['available_cnxsets'] = repo.cnxsets.qsize()
         results['threads'] = [t.name for t in threading.enumerate()]