Add AggregationTemporality Enum

implementations/micrometer-registry-otlp/src/main/java/io/micrometer/registry/otlp/AggregationTemporality.java

@@ -0,0 +1,34 @@
+/*
+ * Copyright 2023 VMware, Inc.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * https://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package io.micrometer.registry.otlp;
+
+public enum AggregationTemporality {
+
+    AGGREGATION_TEMPORALITY_DELTA, AGGREGATION_TEMPORALITY_CUMULATIVE;
+
+    public static io.opentelemetry.proto.metrics.v1.AggregationTemporality mapToOtlp(
+            AggregationTemporality aggregationTemporality) {
+        switch (aggregationTemporality) {
+            case AGGREGATION_TEMPORALITY_DELTA:
+                return io.opentelemetry.proto.metrics.v1.AggregationTemporality.AGGREGATION_TEMPORALITY_DELTA;
+            case AGGREGATION_TEMPORALITY_CUMULATIVE:
+                return io.opentelemetry.proto.metrics.v1.AggregationTemporality.AGGREGATION_TEMPORALITY_CUMULATIVE;
+            default:
+                return io.opentelemetry.proto.metrics.v1.AggregationTemporality.UNRECOGNIZED;
+        }
+    }
+
+}

implementations/micrometer-registry-otlp/src/main/java/io/micrometer/registry/otlp/OtlpConfig.java

@@ -17,7 +17,6 @@
 
 import io.micrometer.core.instrument.config.validate.Validated;
 import io.micrometer.core.instrument.push.PushRegistryConfig;
-import io.opentelemetry.proto.metrics.v1.AggregationTemporality;
 
 import java.util.Arrays;
 import java.util.Map;

implementations/micrometer-registry-otlp/src/main/java/io/micrometer/registry/otlp/OtlpMeterRegistry.java

@@ -71,6 +71,8 @@ public class OtlpMeterRegistry extends PushMeterRegistry {
 
     private final boolean isDeltaAggregationTemporality;
 
+    private final io.opentelemetry.proto.metrics.v1.AggregationTemporality otlpAggregationTemporality;
+
     public OtlpMeterRegistry() {
         this(OtlpConfig.DEFAULT, Clock.SYSTEM);
     }
@@ -88,6 +90,7 @@ private OtlpMeterRegistry(OtlpConfig config, Clock clock, HttpSender httpSender)
         this.resource = Resource.newBuilder().addAllAttributes(getResourceAttributes()).build();
         this.isDeltaAggregationTemporality = config
                 .aggregationTemporality() == AggregationTemporality.AGGREGATION_TEMPORALITY_DELTA;
+        this.otlpAggregationTemporality = AggregationTemporality.mapToOtlp(config.aggregationTemporality());
         config().namingConvention(NamingConvention.dot);
         start(DEFAULT_THREAD_FACTORY);
     }
@@ -222,7 +225,7 @@ private Metric writeSum(Meter meter, DoubleSupplier count) {
                 .addDataPoints(NumberDataPoint.newBuilder().setStartTimeUnixNano(getStartTimeNanos(meter))
                         .setTimeUnixNano(getEndTimeNanos()).setAsDouble(count.getAsDouble())
                         .addAllAttributes(getTagsForId(meter.getId())).build())
-                .setIsMonotonic(true).setAggregationTemporality(config.aggregationTemporality()).build()).build();
+                .setIsMonotonic(true).setAggregationTemporality(otlpAggregationTemporality).build()).build();
     }
 
     // VisibleForTesting
@@ -263,13 +266,13 @@ Metric writeHistogramSupport(HistogramSupport histogramSupport) {
                         isTimeBased ? countAtBucket.bucket(getBaseTimeUnit()) : countAtBucket.bucket());
                 histogramDataPoint.addBucketCounts((long) countAtBucket.count());
             }
-            metricBuilder.setHistogram(Histogram.newBuilder().setAggregationTemporality(config.aggregationTemporality())
+            metricBuilder.setHistogram(Histogram.newBuilder().setAggregationTemporality(otlpAggregationTemporality)
                     .addDataPoints(histogramDataPoint));
             return metricBuilder.build();
         }
 
-        return metricBuilder.setHistogram(Histogram.newBuilder()
-                .setAggregationTemporality(config.aggregationTemporality()).addDataPoints(histogramDataPoint)).build();
+        return metricBuilder.setHistogram(Histogram.newBuilder().setAggregationTemporality(otlpAggregationTemporality)
+                .addDataPoints(histogramDataPoint)).build();
     }
 
     // VisibleForTesting
@@ -278,7 +281,7 @@ Metric writeFunctionTimer(FunctionTimer functionTimer) {
                 .addDataPoints(HistogramDataPoint.newBuilder().addAllAttributes(getTagsForId(functionTimer.getId()))
                         .setStartTimeUnixNano(getStartTimeNanos((functionTimer))).setTimeUnixNano(getEndTimeNanos())
                         .setSum(functionTimer.totalTime(getBaseTimeUnit())).setCount((long) functionTimer.count()))
-                .setAggregationTemporality(config.aggregationTemporality())).build();
+                .setAggregationTemporality(otlpAggregationTemporality)).build();
     }
 
     private long getStartTimeNanos(Meter meter) {

implementations/micrometer-registry-otlp/src/test/java/io/micrometer/registry/otlp/DeltaOtlpMeterRegistryTest.java

@@ -23,6 +23,7 @@
 import java.util.concurrent.TimeUnit;
 import java.util.concurrent.atomic.AtomicLong;
 
+import static io.micrometer.registry.otlp.AggregationTemporality.AGGREGATION_TEMPORALITY_DELTA;
 import static org.assertj.core.api.Assertions.assertThat;
 
 class DeltaOtlpMeterRegistryTest {
@@ -38,7 +39,7 @@ class DeltaOtlpMeterRegistryTest {
     OtlpConfig otlpConfig = new OtlpConfig() {
         @Override
         public AggregationTemporality aggregationTemporality() {
-            return AggregationTemporality.AGGREGATION_TEMPORALITY_DELTA;
+            return AGGREGATION_TEMPORALITY_DELTA;
         }
 
         @Override
@@ -186,7 +187,7 @@ private void assertHistogram(Metric metric, long startTime, long endTime, String
         assertThat(histogram.getAttributes(0).getKey()).hasToString(meterTag.getKey());
         assertThat(histogram.getAttributes(0).getValue().getStringValue()).hasToString(meterTag.getValue());
         assertThat(metric.getHistogram().getAggregationTemporality())
-                .isEqualTo(AggregationTemporality.AGGREGATION_TEMPORALITY_DELTA);
+                .isEqualTo(AggregationTemporality.mapToOtlp(AGGREGATION_TEMPORALITY_DELTA));
     }
 
     private void assertSum(Metric metric, long startTime, long endTime, double expectedValue) {
@@ -200,7 +201,7 @@ private void assertSum(Metric metric, long startTime, long endTime, double expec
         assertThat(sumDataPoint.getAttributes(0).getKey()).hasToString(meterTag.getKey());
         assertThat(sumDataPoint.getAttributes(0).getValue().getStringValue()).hasToString(meterTag.getValue());
         assertThat(metric.getSum().getAggregationTemporality())
-                .isEqualTo(AggregationTemporality.AGGREGATION_TEMPORALITY_DELTA);
+                .isEqualTo(AggregationTemporality.mapToOtlp(AGGREGATION_TEMPORALITY_DELTA));
     }
 
     private void stepOverNStep(int numStepsToSkip) {

implementations/micrometer-registry-otlp/src/test/java/io/micrometer/registry/otlp/OtlpConfigTest.java

@@ -15,7 +15,6 @@
  */
 package io.micrometer.registry.otlp;
 
-import io.opentelemetry.proto.metrics.v1.AggregationTemporality;
 import org.junit.jupiter.api.Test;
 
 import java.util.Collections;