From 59b5b9682fee88b2530b85655ac3b21d28a7f06e Mon Sep 17 00:00:00 2001
From: Liuxiaozhen12 <82579298+Liuxiaozhen12@users.noreply.github.com>
Date: Thu, 2 Sep 2021 16:32:38 +0800
Subject: [PATCH 1/2] Update alert rule for low space

---
 alert-rules.md | 13 +++++++++++--
 1 file changed, 11 insertions(+), 2 deletions(-)

diff --git a/alert-rules.md b/alert-rules.md
index 448b88294ed55..b9800a52a227a 100644
--- a/alert-rules.md
+++ b/alert-rules.md
@@ -752,11 +752,20 @@ This section gives the alert rules for the TiKV component.
 
     Check which kind of tasks has a higher value. You can normally find a solution to the Coprocessor and apply worker tasks from other metrics.
 
-#### `TiKV_low_space_and_add_region`
+#### `TiKV_low_space`
 
 * Alert rule:
 
-    `count((sum(tikv_store_size_bytes{type="available"}) by (instance) / sum(tikv_store_size_bytes{type="capacity"}) by (instance) < 0.2) and (sum(tikv_raftstore_snapshot_traffic_total{type="applying"}) by (instance) > 0)) > 0`
+    `sum(tikv_store_size_bytes{type="available"}) by (instance) / sum(tikv_store_size_bytes{type="capacity"}) by (instance) < 0.2`
+
+* Description:
+
+    The data volume of TiKV exceeds 80% of the node configuration capacity or the disk capacity of the machine.
+
+* Solution:
+
+    * Check the balance condition of node space.
+    * Make a plan to increase the disk capacity or delete some data or increase cluster node depending on different situations.
 
 #### `TiKV_approximate_region_size`
 

From 3654fe7c94ccd6cbd3ec1407175bd5283178dbf1 Mon Sep 17 00:00:00 2001
From: TomShawn <41534398+TomShawn@users.noreply.github.com>
Date: Wed, 8 Sep 2021 11:42:18 +0800
Subject: [PATCH 2/2] Update alert-rules.md

---
 alert-rules.md | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/alert-rules.md b/alert-rules.md
index b9800a52a227a..1ed724b2cf2d1 100644
--- a/alert-rules.md
+++ b/alert-rules.md
@@ -760,7 +760,7 @@ This section gives the alert rules for the TiKV component.
 
 * Description:
 
-    The data volume of TiKV exceeds 80% of the node configuration capacity or the disk capacity of the machine.
+    The data volume of TiKV exceeds 80% of the configured node capacity or the disk capacity of the machine.
 
 * Solution: