cc postgresql: log error in watchdog

commit_hash:e0b4ebbdd71ef48b96ae294c346ecdb4bb3489f3

Author: ArkadyRudenko

postgresql/src/storages/postgres/connlimit_watchdog.cpp

@@ -183,6 +183,7 @@ void ConnlimitWatchdog::DoStep(
                 steps_with_errors_ = 0;
             }
         }
+        LOG_WARNING() << fmt::format("Can't connect to u_clients. Fallback max_size to {}. ", connlimit_.load()) << e;
     }
 
     on_new_connlimit_();