diff --git a/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/DefaultExemplarSamplerFactory.java b/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/DefaultExemplarSamplerFactory.java
index 295c5d822f..e4be6236fa 100644
--- a/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/DefaultExemplarSamplerFactory.java
+++ b/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/DefaultExemplarSamplerFactory.java
@@ -27,7 +27,6 @@
  * Default implementation of {@link ExemplarSamplerFactory}.
  *
  * @author Jonatan Ivanov
- * @since 1.13.0
  */
 class DefaultExemplarSamplerFactory implements ExemplarSamplerFactory {
 
@@ -39,7 +38,7 @@ class DefaultExemplarSamplerFactory implements ExemplarSamplerFactory {
 
     private final SpanContext spanContext;
 
-    public DefaultExemplarSamplerFactory(SpanContext spanContext, ExemplarsProperties exemplarsProperties) {
+    DefaultExemplarSamplerFactory(SpanContext spanContext, ExemplarsProperties exemplarsProperties) {
         this.spanContext = spanContext;
         this.exemplarsProperties = exemplarsProperties;
     }
@@ -52,10 +51,9 @@ public ExemplarSampler createExemplarSampler(int numberOfExemplars) {
     }
 
     @Override
-    public ExemplarSampler createExemplarSampler(double[] histogramClassicUpperBounds) {
+    public ExemplarSampler createExemplarSampler(double[] histogramUpperBounds) {
         ExemplarSamplerConfig config = exemplarSamplerConfigsByHistogramUpperBounds.computeIfAbsent(
-                histogramClassicUpperBounds,
-                key -> new ExemplarSamplerConfig(exemplarsProperties, histogramClassicUpperBounds));
+                histogramUpperBounds, key -> new ExemplarSamplerConfig(exemplarsProperties, histogramUpperBounds));
         return new ExemplarSampler(config, spanContext);
     }
 
diff --git a/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/ExemplarSamplerFactory.java b/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/ExemplarSamplerFactory.java
index 61663b2d6f..5d6441bb0d 100644
--- a/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/ExemplarSamplerFactory.java
+++ b/implementations/micrometer-registry-prometheus/src/main/java/io/micrometer/prometheusmetrics/ExemplarSamplerFactory.java
@@ -21,7 +21,6 @@
  * A factory that creates {@link ExemplarSampler} instances with the desired properties.
  *
  * @author Jonatan Ivanov
- * @since 1.13.0
  */
 interface ExemplarSamplerFactory {
 
@@ -34,7 +33,7 @@ interface ExemplarSamplerFactory {
 
     /**
      * Creates an {@link ExemplarSampler} that stores exemplars for the defined histogram
-     * buckets. This means as many exemplars as many buckets are defined.
+     * buckets. This means as many exemplars as buckets are defined.
      * @param histogramUpperBounds histogram buckets to store exemplars for.
      * @return a new {@link ExemplarSampler} instance.
      */
diff --git a/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java b/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java
index 5499651b5e..d2475e39e0 100644
--- a/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java
+++ b/implementations/micrometer-registry-prometheus/src/test/java/io/micrometer/prometheusmetrics/PrometheusMeterRegistryTest.java
@@ -871,18 +871,18 @@ void openMetricsScrapeWithExemplars() throws InterruptedException {
 
         Timer timerWithHistogram = Timer.builder("timer.withHistogram").publishPercentileHistogram().register(registry);
         timerWithHistogram.record(15, TimeUnit.MILLISECONDS);
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         timerWithHistogram.record(150, TimeUnit.MILLISECONDS);
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         timerWithHistogram.record(60, TimeUnit.SECONDS);
 
         Timer timerWithSlos = Timer.builder("timer.withSlos")
             .serviceLevelObjectives(Duration.ofMillis(100), Duration.ofMillis(200), Duration.ofMillis(300))
             .register(registry);
         timerWithSlos.record(Duration.ofMillis(15));
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         timerWithSlos.record(Duration.ofMillis(1_500));
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         timerWithSlos.record(Duration.ofMillis(150));
 
         DistributionSummary summary = DistributionSummary.builder("summary.noHistogram").register(registry);
@@ -894,18 +894,18 @@ void openMetricsScrapeWithExemplars() throws InterruptedException {
             .publishPercentileHistogram()
             .register(registry);
         summaryWithHistogram.record(0.15);
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         summaryWithHistogram.record(5E18);
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         summaryWithHistogram.record(15);
 
         DistributionSummary slos = DistributionSummary.builder("summary.withSlos")
             .serviceLevelObjectives(100, 200, 300)
             .register(registry);
         slos.record(10);
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         slos.record(1_000);
-        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+        sleepToAvoidRateLimiting();
         slos.record(250);
 
         String scraped = registry.scrape("application/openmetrics-text");
@@ -944,6 +944,10 @@ void openMetricsScrapeWithExemplars() throws InterruptedException {
         assertThat(scraped).endsWith("# EOF\n");
     }
 
+    private static void sleepToAvoidRateLimiting() throws InterruptedException {
+        Thread.sleep(5); // sleeping 5ms since the sample interval limit is 1ms
+    }
+
     @Test
     void noExemplarsIfNoSampler() {
         PrometheusMeterRegistry registry = new PrometheusMeterRegistry(PrometheusConfig.DEFAULT, prometheusRegistry,
diff --git a/samples/micrometer-samples-core/src/main/java/io/micrometer/core/samples/PrometheusExemplarsSample.java b/samples/micrometer-samples-core/src/main/java/io/micrometer/core/samples/PrometheusExemplarsSample.java
index 8bf569f898..ca5b38ded1 100644
--- a/samples/micrometer-samples-core/src/main/java/io/micrometer/core/samples/PrometheusExemplarsSample.java
+++ b/samples/micrometer-samples-core/src/main/java/io/micrometer/core/samples/PrometheusExemplarsSample.java
@@ -40,26 +40,26 @@ public static void main(String[] args) throws InterruptedException {
 
         Timer timer = Timer.builder("test.timer").publishPercentileHistogram().register(registry);
         timer.record(Duration.ofNanos(1_000 * 100));
-        sleep(); // sleeping to avoid rate-limiting
+        sleepToAvoidRateLimiting();
         timer.record(Duration.ofMillis(2));
-        sleep(); // sleeping to avoid rate-limiting
+        sleepToAvoidRateLimiting();
         timer.record(Duration.ofMillis(100));
-        sleep(); // sleeping to avoid rate-limiting
+        sleepToAvoidRateLimiting();
         timer.record(Duration.ofSeconds(60));
 
         DistributionSummary distributionSummary = DistributionSummary.builder("test.distribution")
             .publishPercentileHistogram()
             .register(registry);
         distributionSummary.record(0.15);
-        sleep(); // sleeping to avoid rate-limiting
+        sleepToAvoidRateLimiting();
         distributionSummary.record(15);
-        sleep(); // sleeping to avoid rate-limiting
+        sleepToAvoidRateLimiting();
         distributionSummary.record(5E18);
 
         System.out.println(registry.scrape(CONTENT_TYPE_OPENMETRICS_100));
     }
 
-    static void sleep() {
+    static void sleepToAvoidRateLimiting() {
         try {
             // sleeping 100ms since the sample interval limit is 90ms
             Thread.sleep(100);