From 96d096e2f93c032c80b23bd58224de667028fb09 Mon Sep 17 00:00:00 2001
From: Moritz Halbritter <moritz.halbritter@broadcom.com>
Date: Wed, 3 Sep 2025 15:12:20 +0200
Subject: [PATCH] Improve null-safety of module/spring-boot-micrometer-metrics

See gh-46926
---
 .../micrometer/metrics/actuate/endpoint/MetricsEndpoint.java   | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/actuate/endpoint/MetricsEndpoint.java b/module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/actuate/endpoint/MetricsEndpoint.java
index 91595393321..9f8fded2d16 100644
--- a/module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/actuate/endpoint/MetricsEndpoint.java
+++ b/module/spring-boot-micrometer-metrics/src/main/java/org/springframework/boot/micrometer/metrics/actuate/endpoint/MetricsEndpoint.java
@@ -78,7 +78,8 @@ public class MetricsEndpoint {
 	}
 
 	@ReadOperation
-	public @Nullable MetricDescriptor metric(@Selector String requiredMetricName, @OptionalParameter List<String> tag) {
+	public @Nullable MetricDescriptor metric(@Selector String requiredMetricName,
+			@OptionalParameter @Nullable List<String> tag) {
 		List<Tag> tags = parseTags(tag);
 		Collection<Meter> meters = findFirstMatchingMeters(this.registry, requiredMetricName, tags);
 		if (meters.isEmpty()) {