From 8668757459feca8b5792662d2dacd07b0bf94e74 Mon Sep 17 00:00:00 2001
From: Maryam Saeidi <maryam.saeidi@elastic.co>
Date: Tue, 12 Nov 2024 13:01:36 +0100
Subject: [PATCH] [Custom threshold] Fix the custom equation label on the
 preview lens chart (#199618)

Fixes #181876

## Summary

This PR fixes the custom equation label on the preview lens chart.

|With label|Without label|With group by field|
|---|---|---|

|![image](https://github.com/user-attachments/assets/b4f1a1e7-8e67-4b24-ae48-379fe393f90a)|![image](https://github.com/user-attachments/assets/3ef2733f-9ce8-4b37-8ecf-c19c1371aced)|![image](https://github.com/user-attachments/assets/d638f49e-98e2-4df7-8852-84dc62b9f739)|
---
 .../components/rule_condition_chart/rule_condition_chart.tsx | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/x-pack/plugins/observability_solution/observability/public/components/rule_condition_chart/rule_condition_chart.tsx b/x-pack/plugins/observability_solution/observability/public/components/rule_condition_chart/rule_condition_chart.tsx
index 407637520dda7..4567d7c37b10b 100644
--- a/x-pack/plugins/observability_solution/observability/public/components/rule_condition_chart/rule_condition_chart.tsx
+++ b/x-pack/plugins/observability_solution/observability/public/components/rule_condition_chart/rule_condition_chart.tsx
@@ -68,6 +68,7 @@ export interface RuleConditionChartExpressions {
   timeSize?: number;
   timeUnit?: TimeUnitChar;
   equation?: string;
+  label?: string;
 }
 export interface RuleConditionChartProps {
   metricExpression: RuleConditionChartExpressions;
@@ -108,6 +109,7 @@ export function RuleConditionChart({
     threshold,
     comparator,
     equation,
+    label,
     warningComparator,
     warningThreshold,
   } = metricExpression;
@@ -332,7 +334,7 @@ export function RuleConditionChart({
     const baseLayer = {
       type: 'formula',
       value: formula,
-      label: formula,
+      label: label ?? formula,
       groupBy,
       format: {
         id: formatId,
@@ -409,6 +411,7 @@ export function RuleConditionChart({
     comparator,
     dataView,
     equation,
+    label,
     searchConfiguration,
     formula,
     formulaAsync.value,