From e62f2a7b743974d72fe9a3792a8a43a4a5e3e021 Mon Sep 17 00:00:00 2001
From: "Grot (@grafanabot)" <43478413+grafanabot@users.noreply.github.com>
Date: Fri, 8 Jul 2022 18:22:35 +0200
Subject: [PATCH] Prometheus datasource: query builder freezes when metrics
 metadata is undefined (#51929) (#51988)

* add error handling for prom query builder returning undefined metrics metadata

* remove reference to escalation

(cherry picked from commit e51187a47420c91cde38f1aa3fed445776f82fae)

Co-authored-by: Brendan O'Handley <brendan.ohandley@grafana.com>
---
 .../prometheus/querybuilder/components/PromQueryBuilder.tsx  | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilder.tsx b/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilder.tsx
index 3fba042d304..d088e79fe70 100644
--- a/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilder.tsx
+++ b/public/app/plugins/datasource/prometheus/querybuilder/components/PromQueryBuilder.tsx
@@ -134,6 +134,11 @@ async function getMetrics(
     await datasource.languageProvider.loadMetricsMetadata();
   }
 
+  // Error handling for when metrics metadata returns as undefined
+  if (!datasource.languageProvider.metricsMetadata) {
+    datasource.languageProvider.metricsMetadata = {};
+  }
+
   let metrics;
   if (query.labels.length > 0) {
     const expr = promQueryModeller.renderLabels(query.labels);