From 96c1cd225cd2e761fdd681ed5e556c3bbff77c06 Mon Sep 17 00:00:00 2001
From: Paul Marbach <paul.marbach@grafana.com>
Date: Mon, 4 Aug 2025 15:51:30 -0400
Subject: [PATCH] Transforms: GroupToMatrix transform should retain keyRowField
 config (#109066)

---
 .../transformations/transformers/groupingToMatrix.test.ts   | 6 ++++--
 .../src/transformations/transformers/groupingToMatrix.ts    | 2 +-
 2 files changed, 5 insertions(+), 3 deletions(-)

diff --git a/packages/grafana-data/src/transformations/transformers/groupingToMatrix.test.ts b/packages/grafana-data/src/transformations/transformers/groupingToMatrix.test.ts
index e23c1ebf456..9b3956a12f2 100644
--- a/packages/grafana-data/src/transformations/transformers/groupingToMatrix.test.ts
+++ b/packages/grafana-data/src/transformations/transformers/groupingToMatrix.test.ts
@@ -21,7 +21,7 @@ describe('Grouping to Matrix', () => {
     const seriesA = toDataFrame({
       name: 'A',
       fields: [
-        { name: 'Time', type: FieldType.time, values: [1000, 1001, 1002] },
+        { name: 'Time', type: FieldType.time, values: [1000, 1001, 1002], config: { interval: 60000 } },
         { name: 'Value', type: FieldType.number, values: [1, 2, 3] },
       ],
     });
@@ -33,7 +33,9 @@ describe('Grouping to Matrix', () => {
           name: 'Time\\Time',
           type: FieldType.time,
           values: [1000, 1001, 1002],
-          config: {},
+          config: {
+            interval: 60000,
+          },
         },
         {
           name: '1000',
diff --git a/packages/grafana-data/src/transformations/transformers/groupingToMatrix.ts b/packages/grafana-data/src/transformations/transformers/groupingToMatrix.ts
index e9d33f33587..2a9ae7eb03b 100644
--- a/packages/grafana-data/src/transformations/transformers/groupingToMatrix.ts
+++ b/packages/grafana-data/src/transformations/transformers/groupingToMatrix.ts
@@ -108,7 +108,7 @@ export const groupingToMatrixTransformer: DataTransformerInfo<GroupingToMatrixTr
             name: rowColumnField,
             values: rowValues,
             type: keyRowField.type,
-            config: {},
+            config: { ...keyRowField.config },
           },
         ];