From 2085397f31a672be01aa234416bf1366202b4a9b Mon Sep 17 00:00:00 2001
From: Alexander Zobnin <alexanderzobnin@gmail.com>
Date: Mon, 11 Mar 2019 15:54:40 +0300
Subject: [PATCH] heatmap: fix middle bucket bound for prometheus

---
 public/app/plugins/panel/heatmap/heatmap_ctrl.ts | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/public/app/plugins/panel/heatmap/heatmap_ctrl.ts b/public/app/plugins/panel/heatmap/heatmap_ctrl.ts
index 0f44dbd477b..33d4511f18e 100644
--- a/public/app/plugins/panel/heatmap/heatmap_ctrl.ts
+++ b/public/app/plugins/panel/heatmap/heatmap_ctrl.ts
@@ -231,7 +231,10 @@ export class HeatmapCtrl extends MetricsPanelCtrl {
 
     tsBuckets = _.map(this.series, 'label');
     const yBucketBound = this.panel.yBucketBound;
-    if ((panelDatasource === 'prometheus' && yBucketBound !== 'lower') || yBucketBound === 'upper') {
+    if (
+      (panelDatasource === 'prometheus' && yBucketBound !== 'lower' && yBucketBound !== 'middle') ||
+      yBucketBound === 'upper'
+    ) {
       // Prometheus labels are upper inclusive bounds, so add empty bottom bucket label.
       tsBuckets = [''].concat(tsBuckets);
     } else {