From a7d304a871c32e5cfed27e8986e8b2a5fefa3fed Mon Sep 17 00:00:00 2001
From: Darren Janeczek <38694490+darrenjaneczek@users.noreply.github.com>
Date: Fri, 24 May 2024 15:41:00 -0400
Subject: [PATCH] datatrails: on histogram breakdowns, show label value in
 legend (#88154)

fix: on histogram breakdowns, show label value in legend
---
 .../AutomaticMetricQueries/query-generators/histogram.ts | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/public/app/features/trails/AutomaticMetricQueries/query-generators/histogram.ts b/public/app/features/trails/AutomaticMetricQueries/query-generators/histogram.ts
index b6fc3903c1f..e6e4644bb15 100644
--- a/public/app/features/trails/AutomaticMetricQueries/query-generators/histogram.ts
+++ b/public/app/features/trails/AutomaticMetricQueries/query-generators/histogram.ts
@@ -68,9 +68,16 @@ function heatMapQuery(groupings: string[] = []): PromQuery {
 function percentileQuery(percentile: number, groupings: string[] = []) {
   const percent = percentile / 100;
 
+  let legendFormat = `${percentile}th Percentile`;
+
+  // For the breakdown view, show the label value variable we are grouping by
+  if (groupings[0]) {
+    legendFormat = `{{${groupings[0]}}}`;
+  }
+
   return {
     refId: `Percentile${percentile}`,
     expr: `histogram_quantile(${percent}, ${baseQuery(groupings)})`,
-    legendFormat: `${percentile}th Percentile`,
+    legendFormat,
   };
 }