Update instrumentation/spring/spring-boot-actuator-autoconfigure-2.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/actuator/v2_0/OpenTelemetryMeterRegistryAutoConfiguration.java

Co-authored-by: Trask Stalnaker <trask.stalnaker@gmail.com>

Author: zeitlinger

instrumentation/spring/spring-boot-actuator-autoconfigure-2.0/javaagent/src/main/java/io/opentelemetry/javaagent/instrumentation/spring/actuator/v2_0/OpenTelemetryMeterRegistryAutoConfiguration.java

@@ -50,7 +50,8 @@ public Object postProcessAfterInitialization(Object bean, String beanName) {
         if (bean instanceof CompositeMeterRegistry) {
           CompositeMeterRegistry original = (CompositeMeterRegistry) bean;
           List<MeterRegistry> list = new ArrayList<>(original.getRegistries());
-          // sort otel registry last
+          // sort otel registry last since it doesn't support reading metric values
+          // and the actuator endpoint reads metrics from the first registry
           list.sort(
               Comparator.comparingInt(
                   value -> value == MicrometerSingletons.meterRegistry() ? 1 : 0));