Merge branch '1.8.x' into 1.9.x

Author: shakuzen

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

@@ -17,6 +17,7 @@
 
 import io.micrometer.core.instrument.distribution.*;
 import io.micrometer.core.instrument.distribution.pause.ClockDriftPauseDetector;
+import io.micrometer.core.instrument.distribution.pause.NoPauseDetector;
 import io.micrometer.core.instrument.distribution.pause.PauseDetector;
 import io.micrometer.core.lang.Nullable;
 import org.LatencyUtils.IntervalEstimator;
@@ -101,6 +102,9 @@ else if (distributionStatisticConfig.isPublishingHistogram()) {
     }
 
     private void initPauseDetector(PauseDetector pauseDetectorType) {
+        if (pauseDetectorType instanceof NoPauseDetector) {
+            return;
+        }
         pauseDetector = pauseDetectorCache.computeIfAbsent(pauseDetectorType, detector -> {
             if (detector instanceof ClockDriftPauseDetector) {
                 ClockDriftPauseDetector clockDriftPauseDetector = (ClockDriftPauseDetector) detector;

samples/micrometer-samples-boot2/build.gradle

@@ -10,7 +10,11 @@ repositories {
 }
 
 dependencies {
-    implementation project(":micrometer-core")
+    implementation(project(":micrometer-core")) {
+        // see gh-1599; pause detection and percentiles are not configured so these dependencies can be excluded
+        exclude module: 'LatencyUtils'
+        exclude module: 'HdrHistogram'
+    }
     ['atlas', 'azure-monitor', 'prometheus', 'datadog', 'elastic', 'ganglia', 'graphite', 'health', 'jmx', 'influx', 'statsd', 'new-relic', 'cloudwatch', 'cloudwatch2', 'signalfx', 'wavefront', 'elastic', 'dynatrace', 'humio', 'appoptics', 'stackdriver'].each { sys ->
         implementation project(":micrometer-registry-$sys")
     }