Improve null-safety of module/spring-boot-micrometer-metrics

mhalbritter · mhalbritter · commit 96d096e2f93c · 2025-09-03T15:12:20.000+02:00
See gh-46926
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
@@ -78,7 +78,8 @@ private String getName(Meter meter) {
 	}
 
 	@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()) {

Original file line number	Diff line number	Diff line change
`@@ -78,7 +78,8 @@ private String getName(Meter meter) {`
`78`	`78`	`}`
`79`	`79`
`80`	`80`	`@ReadOperation`
`81`		`- public @Nullable MetricDescriptor metric(@Selector String requiredMetricName, @OptionalParameter List<String> tag) {`
	`81`	`+ public @Nullable MetricDescriptor metric(@Selector String requiredMetricName,`
	`82`	`+ @OptionalParameter @Nullable List<String> tag) {`
`82`	`83`	`List<Tag> tags = parseTags(tag);`
`83`	`84`	`Collection<Meter> meters = findFirstMatchingMeters(this.registry, requiredMetricName, tags);`
`84`	`85`	`if (meters.isEmpty()) {`