Heatmap: Support for linear y axis (#113337)

* wip

* boop

* Base factor on data

* Add some basic option control

* Remove old comments

* Add feature flag

* Apply feature flag to axis options

* Turn factor calculation into exported function

* Simplify bucket factor function

* Clarify comments

* Fix cell sizing of pre-bucketed heatmaps with log

* Remove unnecessary category change

* Consolidate editor for calculate from data no

* Update bucket function sanity checks

* Wire up scale config from yBucketScale

* Hide bucket controls for heatmap cells

* Fix splits

* Add test coverage

* Fix failing test

* Add basic util test coverage

* Fix tooltip for legacy in linear

* Fix y bucket option width to be consistent

* Hide tick alignment for explicit scale modes

* Clarify comment

* Make sure units are passed properly for linear

* Remove null assertion operator

* Clean up nested ternary

* Add type protection to scaleLog

* Remove repeated code for ySize calcs

* Remove ternary for scaleDistribution

* Add test coverage for YBucketScaleEditor

* Add isHeatmapSparse function to tooltip utils

* Create calculateYSizeDivisor util function

* Fix y axis min and max options and extend to log

* Add toLogBase test coverage

* Create applyExplicitMinMax function

* Add additional test coverage for scale editor

* Run i18n-extract

* Update eslint suppressions

---------

Co-authored-by: Drew Slobodnjak <60050885+drew08t@users.noreply.github.com>

pkg/services/featuremgmt/registry.go

@@ -1928,6 +1928,14 @@ var (
 			Owner:        grafanaDatavizSquad,
 			Expression:   "false",
 		},
+		{
+			Name:         "heatmapRowsAxisOptions",
+			Description:  "Enable Y-axis scale configuration options for pre-bucketed heatmap data (heatmap-rows)",
+			Stage:        FeatureStageExperimental,
+			FrontendOnly: true,
+			Owner:        grafanaDatavizSquad,
+			Expression:   "false",
+		},
 		{
 			Name:         "preventPanelChromeOverflow",
 			Description:  "Restrict PanelChrome contents with overflow: hidden;",

pkg/services/featuremgmt/toggles_gen.csv

@@ -262,6 +262,7 @@ pluginInstallAPISync,experimental,@grafana/plugins-platform-backend,false,false,
 newGauge,experimental,@grafana/dataviz-squad,false,false,true
 newVizSuggestions,preview,@grafana/dataviz-squad,false,false,true
 externalVizSuggestions,experimental,@grafana/dataviz-squad,false,false,true
+heatmapRowsAxisOptions,experimental,@grafana/dataviz-squad,false,false,true
 preventPanelChromeOverflow,preview,@grafana/grafana-frontend-platform,false,false,true
 jaegerEnableGrpcEndpoint,experimental,@grafana/oss-big-tent,false,false,false
 pluginStoreServiceLoading,experimental,@grafana/plugins-platform-backend,false,false,false

pkg/services/featuremgmt/toggles_gen.json

@@ -1647,6 +1647,20 @@
         "codeowner": "@grafana/search-and-storage"
       }
     },
+    {
+      "metadata": {
+        "name": "heatmapRowsAxisOptions",
+        "resourceVersion": "1765353244400",
+        "creationTimestamp": "2025-12-10T07:54:04Z"
+      },
+      "spec": {
+        "description": "Enable Y-axis scale configuration options for pre-bucketed heatmap data (heatmap-rows)",
+        "stage": "experimental",
+        "codeowner": "@grafana/dataviz-squad",
+        "frontend": true,
+        "expression": "false"
+      }
+    },
     {
       "metadata": {
         "name": "improvedExternalSessionHandling",