Update AsynchronousMetrics.cpp

src/Common/AsynchronousMetrics.cpp

@@ -683,6 +683,11 @@ void AsynchronousMetrics::update(TimePoint update_time)
         catch (...)
         {
             tryLogCurrentException(__PRETTY_FUNCTION__);
+            
+            /// A slight improvement for the rare case when ClickHouse is run inside LXC and LXCFS is used.
+            /// The LXCFS has an issue: sometimes it returns an error "Transport endpoint is not connected" on reading from the file inside `/proc`.
+            /// This error was correctly logged into ClickHouse's server log, but it was a source of annoyance to some users.
+            /// We additionally workaround this issue by reopening a file.
             openFileIfExists("/proc/loadavg", loadavg);
         }
     }