Allow specifying the meterNameConsumer for HighCardinalityTagsDetector

micrometer-core/src/main/java/io/micrometer/core/instrument/MeterRegistry.java

@@ -874,6 +874,24 @@ public Config withHighCardinalityTagsDetector(long threshold, Duration delay) {
                     new HighCardinalityTagsDetector(MeterRegistry.this, threshold, delay));
         }
 
+        /**
+         * Creates and starts a new {@link HighCardinalityTagsDetector} for this registry.
+         * @param threshold The threshold to use to detect high cardinality tags (if the
+         * number of Meters with the same name is higher than this value, that's a high
+         * cardinality tag).
+         * @param delay The delay between the termination of one check and the
+         * commencement of the next.
+         * @param meterNameConsumer A consumer that will be called for each high
+         * cardinality tag detected.
+         * @return This configuration instance.
+         * @since 1.12.0
+         */
+        public Config withHighCardinalityTagsDetector(long threshold, Duration delay,
+                Consumer<String> meterNameConsumer) {
+            return withHighCardinalityTagsDetector(
+                    new HighCardinalityTagsDetector(MeterRegistry.this, threshold, delay, meterNameConsumer));
+        }
+
         private Config withHighCardinalityTagsDetector(HighCardinalityTagsDetector newHighCardinalityTagsDetector) {
             if (highCardinalityTagsDetector != null) {
                 highCardinalityTagsDetector.close();

micrometer-core/src/test/java/io/micrometer/core/instrument/HighCardinalityTagsDetectorTests.java

@@ -90,6 +90,21 @@ void shouldNotDetectNoTags() {
         assertThat(highCardinalityTagsDetector.findFirst()).isEmpty();
     }
 
+    @Test
+    void addsCustomMeterNameConsumer() {
+        TestCustomMeterNameConsumer customMeterNameConsumer = new TestCustomMeterNameConsumer();
+        this.highCardinalityTagsDetector = new HighCardinalityTagsDetector(registry, 3, Duration.ofMinutes(1),
+                customMeterNameConsumer);
+
+        for (int i = 0; i < 4; i++) {
+            Counter.builder("test.counter").tag("index", String.valueOf(i)).register(registry).increment();
+        }
+        highCardinalityTagsDetector.start();
+
+        await().atMost(Duration.ofSeconds(1))
+            .until(() -> "test.counter_customized".equals(customMeterNameConsumer.getName()));
+    }
+
     private static class TestMeterNameConsumer implements Consumer<String> {
 
         @Nullable
@@ -107,4 +122,21 @@ public String getName() {
 
     }
 
+    private static class TestCustomMeterNameConsumer implements Consumer<String> {
+
+        @Nullable
+        private String name;
+
+        @Override
+        public void accept(String name) {
+            this.name = name + "_customized";
+        }
+
+        @Nullable
+        public String getName() {
+            return this.name;
+        }
+
+    }
+
 }