From 3a10d3802b1faf5c60a584ac602e206237093e65 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Mon, 5 Jul 2021 00:33:00 +0300
Subject: [PATCH] Development

---
 src/Interpreters/AsynchronousMetrics.cpp | 4 ++++
 src/Interpreters/AsynchronousMetrics.h   | 3 ---
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/src/Interpreters/AsynchronousMetrics.cpp b/src/Interpreters/AsynchronousMetrics.cpp
index f7e54c661b4..add448b129b 100644
--- a/src/Interpreters/AsynchronousMetrics.cpp
+++ b/src/Interpreters/AsynchronousMetrics.cpp
@@ -533,6 +533,10 @@ void AsynchronousMetrics::update()
                 }
                 else if (name == "MemFree:")
                 {
+                    /// We cannot simply name this metric "Free", because it confuses users.
+                    /// See https://www.linuxatemyram.com/
+                    /// For convenience we also provide OSMemoryFreePlusCached, that should be somewhat similar to OSMemoryAvailable.
+
                     free_plus_cached_bytes += bytes;
                     new_values["OSMemoryFreeWithoutCached"] = bytes;
                 }
diff --git a/src/Interpreters/AsynchronousMetrics.h b/src/Interpreters/AsynchronousMetrics.h
index 247c9858129..2a2d434c007 100644
--- a/src/Interpreters/AsynchronousMetrics.h
+++ b/src/Interpreters/AsynchronousMetrics.h
@@ -2,9 +2,6 @@
 
 #include <Interpreters/Context_fwd.h>
 #include <Common/MemoryStatisticsOS.h>
-#include <Common/MemoryInfoOS.h>
-#include <Common/ProcessorStatisticsOS.h>
-#include <Common/DiskStatisticsOS.h>
 #include <Common/ThreadPool.h>
 #include <IO/ReadBufferFromFile.h>