Polish

spring-boot-project/spring-boot-actuator-autoconfigure/src/main/java/org/springframework/boot/actuate/autoconfigure/metrics/export/prometheus/PrometheusMetricsExportAutoConfiguration.java

@@ -92,7 +92,7 @@ public class PrometheusMetricsExportAutoConfiguration {
 	@Bean
 	@ConditionalOnMissingBean
 	@ConditionalOnBean(SpanContextSupplier.class)
-	public ExemplarSampler exemplarSampler(SpanContextSupplier spanContextSupplier) {
+	public DefaultExemplarSampler exemplarSampler(SpanContextSupplier spanContextSupplier) {
 		return new DefaultExemplarSampler(spanContextSupplier);
 	}
 

spring-boot-project/spring-boot-actuator-autoconfigure/src/test/java/org/springframework/boot/actuate/autoconfigure/tracing/prometheus/PrometheusExemplarsAutoConfigurationTests.java

@@ -83,7 +83,6 @@ class PrometheusExemplarsAutoConfigurationTests {
 			assertThat(context).hasSingleBean(SpanContextSupplier.class);
 			ObservationRegistry observationRegistry = context.getBean(ObservationRegistry.class);
 			Observation.start("test.observation", observationRegistry).stop();
-
 			PrometheusMeterRegistry prometheusMeterRegistry = context.getBean(PrometheusMeterRegistry.class);
 			String openMetricsOutput = prometheusMeterRegistry.scrape(TextFormat.CONTENT_TYPE_OPENMETRICS_100);
 			assertThat(openMetricsOutput).contains("test_observation_seconds_bucket").containsOnlyOnce("trace_id=")