From 5a65a12278179918b95d684d987523b6ae5534ae Mon Sep 17 00:00:00 2001
From: Dominik Prokop <dominik.prokop@grafana.com>
Date: Thu, 7 Jul 2022 16:25:52 +0200
Subject: [PATCH] Time series panel: Fix an issue with stacks being not
 complete due to the incorrect data frame length (#51910)

* Test failure

* Fix
---
 public/app/plugins/panel/timeseries/utils.test.ts | 3 +++
 public/app/plugins/panel/timeseries/utils.ts      | 1 +
 2 files changed, 4 insertions(+)

diff --git a/public/app/plugins/panel/timeseries/utils.test.ts b/public/app/plugins/panel/timeseries/utils.test.ts
index 25239a24685..2eb3ca95674 100644
--- a/public/app/plugins/panel/timeseries/utils.test.ts
+++ b/public/app/plugins/panel/timeseries/utils.test.ts
@@ -100,6 +100,8 @@ describe('prepare timeseries graph', () => {
         3,
       ]
     `);
+
+    expect(frames![0].length).toEqual(6);
   });
 
   it('will insert and convert nulls to a configure "no value" value', () => {
@@ -122,5 +124,6 @@ describe('prepare timeseries graph', () => {
         3,
       ]
     `);
+    expect(frames![0].length).toEqual(6);
   });
 });
diff --git a/public/app/plugins/panel/timeseries/utils.ts b/public/app/plugins/panel/timeseries/utils.ts
index 9d720a321ba..4ec50963908 100644
--- a/public/app/plugins/panel/timeseries/utils.ts
+++ b/public/app/plugins/panel/timeseries/utils.ts
@@ -104,6 +104,7 @@ export function prepareGraphableFields(
     if (hasTimeField && hasValueField) {
       frames.push({
         ...frame,
+        length: nulledFrame.length,
         fields,
       });
     }