Revert "Temporarily move "metrics" package into impl_core/ for release. (#1426)" (#1432)

This reverts commit d3fa0e5c60903f95c184d7c7bafae8fdd12156ad.

27 files changed, 37 insertions, 1542 deletions

diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/Gauge.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/Gauge.java
index 371c762d..e6498066 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/metrics/Gauge.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/Gauge.java
@@ -21,14 +21,14 @@ import static com.google.common.base.Preconditions.checkNotNull;
 import io.opencensus.common.Clock;
 import io.opencensus.common.ToDoubleFunction;
 import io.opencensus.common.ToLongFunction;
-import io.opencensus.implcore.temporary.metrics.LabelKey;
-import io.opencensus.implcore.temporary.metrics.LabelValue;
-import io.opencensus.implcore.temporary.metrics.Metric;
-import io.opencensus.implcore.temporary.metrics.MetricDescriptor;
-import io.opencensus.implcore.temporary.metrics.MetricDescriptor.Type;
-import io.opencensus.implcore.temporary.metrics.Point;
-import io.opencensus.implcore.temporary.metrics.TimeSeries;
-import io.opencensus.implcore.temporary.metrics.Value;
+import io.opencensus.metrics.LabelKey;
+import io.opencensus.metrics.LabelValue;
+import io.opencensus.metrics.Metric;
+import io.opencensus.metrics.MetricDescriptor;
+import io.opencensus.metrics.MetricDescriptor.Type;
+import io.opencensus.metrics.Point;
+import io.opencensus.metrics.TimeSeries;
+import io.opencensus.metrics.Value;
 import java.util.Collections;
 import java.util.List;
 
diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricRegistryImpl.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricRegistryImpl.java
index 294c9207..f3daaef7 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricRegistryImpl.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricRegistryImpl.java
@@ -23,10 +23,10 @@ import io.opencensus.common.ToDoubleFunction;
 import io.opencensus.common.ToLongFunction;
 import io.opencensus.implcore.metrics.Gauge.DoubleGauge;
 import io.opencensus.implcore.metrics.Gauge.LongGauge;
-import io.opencensus.implcore.temporary.metrics.LabelKey;
-import io.opencensus.implcore.temporary.metrics.LabelValue;
-import io.opencensus.implcore.temporary.metrics.Metric;
-import io.opencensus.implcore.temporary.metrics.MetricRegistry;
+import io.opencensus.metrics.LabelKey;
+import io.opencensus.metrics.LabelValue;
+import io.opencensus.metrics.Metric;
+import io.opencensus.metrics.MetricRegistry;
 import java.util.ArrayList;
 import java.util.Collection;
 import java.util.Collections;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricsComponentImplBase.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricsComponentImplBase.java
index 40f8fbe5..46ad028c 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricsComponentImplBase.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/MetricsComponentImplBase.java
@@ -18,8 +18,8 @@ package io.opencensus.implcore.metrics;
 
 import io.opencensus.common.Clock;
 import io.opencensus.implcore.metrics.export.ExportComponentImpl;
-import io.opencensus.implcore.temporary.metrics.MetricRegistry;
-import io.opencensus.implcore.temporary.metrics.MetricsComponent;
+import io.opencensus.metrics.MetricRegistry;
+import io.opencensus.metrics.MetricsComponent;
 
 /** Implementation of {@link MetricsComponent}. */
 public class MetricsComponentImplBase extends MetricsComponent {
diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/export/ExportComponentImpl.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/export/ExportComponentImpl.java
index 18362646..173c3aec 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/metrics/export/ExportComponentImpl.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/export/ExportComponentImpl.java
@@ -16,8 +16,8 @@
 
 package io.opencensus.implcore.metrics.export;
 
-import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
-import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
+import io.opencensus.metrics.export.ExportComponent;
+import io.opencensus.metrics.export.MetricProducerManager;
 
 /** Implementation of {@link ExportComponent}. */
 public final class ExportComponentImpl extends ExportComponent {
diff --git a/impl_core/src/main/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImpl.java b/impl_core/src/main/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImpl.java
index 50d15534..fc9db5c1 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImpl.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImpl.java
@@ -17,8 +17,8 @@
 package io.opencensus.implcore.metrics.export;
 
 import com.google.common.base.Preconditions;
-import io.opencensus.implcore.temporary.metrics.MetricProducer;
-import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
+import io.opencensus.metrics.MetricProducer;
+import io.opencensus.metrics.export.MetricProducerManager;
 import java.util.Collections;
 import java.util.LinkedHashSet;
 import java.util.Set;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/MeasureToViewMap.java b/impl_core/src/main/java/io/opencensus/implcore/stats/MeasureToViewMap.java
index 8ca7bca6..2e28991c 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/MeasureToViewMap.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/MeasureToViewMap.java
@@ -23,7 +23,7 @@ import com.google.common.collect.Sets;
 import io.opencensus.common.Clock;
 import io.opencensus.common.Timestamp;
 import io.opencensus.implcore.internal.CurrentState.State;
-import io.opencensus.implcore.temporary.metrics.Metric;
+import io.opencensus.metrics.Metric;
 import io.opencensus.stats.Measure;
 import io.opencensus.stats.Measurement;
 import io.opencensus.stats.View;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/MetricProducerImpl.java b/impl_core/src/main/java/io/opencensus/implcore/stats/MetricProducerImpl.java
index 6677ef6b..31ef6be1 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/MetricProducerImpl.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/MetricProducerImpl.java
@@ -16,8 +16,8 @@
 
 package io.opencensus.implcore.stats;
 
-import io.opencensus.implcore.temporary.metrics.Metric;
-import io.opencensus.implcore.temporary.metrics.MetricProducer;
+import io.opencensus.metrics.Metric;
+import io.opencensus.metrics.MetricProducer;
 import java.util.Collection;
 import javax.annotation.concurrent.ThreadSafe;
 
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/MetricUtils.java b/impl_core/src/main/java/io/opencensus/implcore/stats/MetricUtils.java
index 20568514..cd1e5364 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/MetricUtils.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/MetricUtils.java
@@ -19,10 +19,10 @@ package io.opencensus.implcore.stats;
 import com.google.common.annotations.VisibleForTesting;
 import io.opencensus.common.Function;
 import io.opencensus.common.Functions;
-import io.opencensus.implcore.temporary.metrics.LabelKey;
-import io.opencensus.implcore.temporary.metrics.LabelValue;
-import io.opencensus.implcore.temporary.metrics.MetricDescriptor;
-import io.opencensus.implcore.temporary.metrics.MetricDescriptor.Type;
+import io.opencensus.metrics.LabelKey;
+import io.opencensus.metrics.LabelValue;
+import io.opencensus.metrics.MetricDescriptor;
+import io.opencensus.metrics.MetricDescriptor.Type;
 import io.opencensus.stats.Aggregation;
 import io.opencensus.stats.Measure;
 import io.opencensus.stats.View;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java b/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java
index e4b33e46..a41850d2 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/MutableAggregation.java
@@ -21,9 +21,9 @@ import static com.google.common.base.Preconditions.checkNotNull;
 
 import com.google.common.annotations.VisibleForTesting;
 import io.opencensus.common.Timestamp;
-import io.opencensus.implcore.temporary.metrics.Distribution;
-import io.opencensus.implcore.temporary.metrics.Point;
-import io.opencensus.implcore.temporary.metrics.Value;
+import io.opencensus.metrics.Distribution;
+import io.opencensus.metrics.Point;
+import io.opencensus.metrics.Value;
 import io.opencensus.stats.Aggregation;
 import io.opencensus.stats.AggregationData;
 import io.opencensus.stats.AggregationData.DistributionData;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/MutableViewData.java b/impl_core/src/main/java/io/opencensus/implcore/stats/MutableViewData.java
index a0e9fd3b..7368a161 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/MutableViewData.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/MutableViewData.java
@@ -32,12 +32,12 @@ import io.opencensus.common.Functions;
 import io.opencensus.common.Timestamp;
 import io.opencensus.implcore.internal.CheckerFrameworkUtils;
 import io.opencensus.implcore.internal.CurrentState.State;
-import io.opencensus.implcore.temporary.metrics.LabelValue;
-import io.opencensus.implcore.temporary.metrics.Metric;
-import io.opencensus.implcore.temporary.metrics.MetricDescriptor;
-import io.opencensus.implcore.temporary.metrics.MetricDescriptor.Type;
-import io.opencensus.implcore.temporary.metrics.Point;
-import io.opencensus.implcore.temporary.metrics.TimeSeries;
+import io.opencensus.metrics.LabelValue;
+import io.opencensus.metrics.Metric;
+import io.opencensus.metrics.MetricDescriptor;
+import io.opencensus.metrics.MetricDescriptor.Type;
+import io.opencensus.metrics.Point;
+import io.opencensus.metrics.TimeSeries;
 import io.opencensus.stats.Aggregation;
 import io.opencensus.stats.AggregationData;
 import io.opencensus.stats.Measure;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/StatsComponentImplBase.java b/impl_core/src/main/java/io/opencensus/implcore/stats/StatsComponentImplBase.java
index 1456746f..72791f04 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/StatsComponentImplBase.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/StatsComponentImplBase.java
@@ -21,8 +21,8 @@ import io.opencensus.common.Clock;
 import io.opencensus.implcore.internal.CurrentState;
 import io.opencensus.implcore.internal.CurrentState.State;
 import io.opencensus.implcore.internal.EventQueue;
-import io.opencensus.implcore.temporary.metrics.MetricProducer;
-import io.opencensus.implcore.temporary.metrics.Metrics;
+import io.opencensus.metrics.MetricProducer;
+import io.opencensus.metrics.Metrics;
 import io.opencensus.stats.StatsCollectionState;
 import io.opencensus.stats.StatsComponent;
 
diff --git a/impl_core/src/main/java/io/opencensus/implcore/stats/StatsManager.java b/impl_core/src/main/java/io/opencensus/implcore/stats/StatsManager.java
index 0fb78480..a58b9a5e 100644
--- a/impl_core/src/main/java/io/opencensus/implcore/stats/StatsManager.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/stats/StatsManager.java
@@ -22,7 +22,7 @@ import io.opencensus.common.Clock;
 import io.opencensus.implcore.internal.CurrentState;
 import io.opencensus.implcore.internal.CurrentState.State;
 import io.opencensus.implcore.internal.EventQueue;
-import io.opencensus.implcore.temporary.metrics.Metric;
+import io.opencensus.metrics.Metric;
 import io.opencensus.stats.View;
 import io.opencensus.stats.ViewData;
 import io.opencensus.tags.TagContext;
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Distribution.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Distribution.java
deleted file mode 100644
index 4e1d1553..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Distribution.java
+++ /dev/null
@@ -1,280 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.common.Timestamp;
-import io.opencensus.internal.Utils;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.List;
-import java.util.Map;
-import java.util.Map.Entry;
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * {@link Distribution} contains summary statistics for a population of values. It optionally
- * contains a histogram representing the distribution of those values across a set of buckets.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@AutoValue
-@Immutable
-public abstract class Distribution {
-
-  Distribution() {}
-
-  /**
-   * Creates a {@link Distribution}.
-   *
-   * @param mean mean of the population values.
-   * @param count count of the population values.
-   * @param sumOfSquaredDeviations sum of squared deviations of the population values.
-   * @param bucketBoundaries bucket boundaries of a histogram.
-   * @param buckets {@link Bucket}s of a histogram.
-   * @return a {@code Distribution}.
-   * @since 0.16
-   */
-  public static Distribution create(
-      double mean,
-      long count,
-      double sumOfSquaredDeviations,
-      List<Double> bucketBoundaries,
-      List<Bucket> buckets) {
-    Utils.checkArgument(count >= 0, "count should be non-negative.");
-    Utils.checkArgument(
-        sumOfSquaredDeviations >= 0, "sum of squared deviations should be non-negative.");
-    if (count == 0) {
-      Utils.checkArgument(mean == 0, "mean should be 0 if count is 0.");
-      Utils.checkArgument(
-          sumOfSquaredDeviations == 0, "sum of squared deviations should be 0 if count is 0.");
-    }
-    return new AutoValue_Distribution(
-        mean,
-        count,
-        sumOfSquaredDeviations,
-        copyBucketBounds(bucketBoundaries),
-        copyBucketCount(buckets));
-  }
-
-  private static List<Double> copyBucketBounds(List<Double> bucketBoundaries) {
-    Utils.checkNotNull(bucketBoundaries, "bucketBoundaries list should not be null.");
-    List<Double> bucketBoundariesCopy = new ArrayList<Double>(bucketBoundaries); // Deep copy.
-    // Check if sorted.
-    if (bucketBoundariesCopy.size() > 1) {
-      double lower = bucketBoundariesCopy.get(0);
-      for (int i = 1; i < bucketBoundariesCopy.size(); i++) {
-        double next = bucketBoundariesCopy.get(i);
-        Utils.checkArgument(lower < next, "bucket boundaries not sorted.");
-        lower = next;
-      }
-    }
-    return Collections.unmodifiableList(bucketBoundariesCopy);
-  }
-
-  private static List<Bucket> copyBucketCount(List<Bucket> buckets) {
-    Utils.checkNotNull(buckets, "bucket list should not be null.");
-    List<Bucket> bucketsCopy = new ArrayList<Bucket>(buckets);
-    for (Bucket bucket : bucketsCopy) {
-      Utils.checkNotNull(bucket, "bucket should not be null.");
-    }
-    return Collections.unmodifiableList(bucketsCopy);
-  }
-
-  /**
-   * Returns the aggregated mean.
-   *
-   * @return the aggregated mean.
-   * @since 0.16
-   */
-  public abstract double getMean();
-
-  /**
-   * Returns the aggregated count.
-   *
-   * @return the aggregated count.
-   * @since 0.16
-   */
-  public abstract long getCount();
-
-  /**
-   * Returns the aggregated sum of squared deviations.
-   *
-   * <p>The sum of squared deviations from the mean of the values in the population. For values x_i
-   * this is:
-   *
-   * <p>Sum[i=1..n]((x_i - mean)^2)
-   *
-   * <p>If count is zero then this field must be zero.
-   *
-   * @return the aggregated sum of squared deviations.
-   * @since 0.16
-   */
-  public abstract double getSumOfSquaredDeviations();
-
-  /**
-   * Returns the bucket boundaries of this distribution.
-   *
-   * <p>The bucket boundaries for that histogram are described by bucket_bounds. This defines
-   * size(bucket_bounds) + 1 (= N) buckets. The boundaries for bucket index i are:
-   *
-   * <ul>
-   *   <li>{@code (-infinity, bucket_bounds[i]) for i == 0}
-   *   <li>{@code [bucket_bounds[i-1], bucket_bounds[i]) for 0 < i < N-2}
-   *   <li>{@code [bucket_bounds[i-1], +infinity) for i == N-1}
-   * </ul>
-   *
-   * <p>i.e. an underflow bucket (number 0), zero or more finite buckets (1 through N - 2, and an
-   * overflow bucket (N - 1), with inclusive lower bounds and exclusive upper bounds.
-   *
-   * <p>If bucket_bounds has no elements (zero size), then there is no histogram associated with the
-   * Distribution. If bucket_bounds has only one element, there are no finite buckets, and that
-   * single element is the common boundary of the overflow and underflow buckets. The values must be
-   * monotonically increasing.
-   *
-   * @return the bucket boundaries of this distribution.
-   * @since 0.16
-   */
-  public abstract List<Double> getBucketBoundaries();
-
-  /**
-   * Returns the aggregated histogram {@link Bucket}s.
-   *
-   * @return the aggregated histogram buckets.
-   * @since 0.16
-   */
-  public abstract List<Bucket> getBuckets();
-
-  /**
-   * The histogram bucket of the population values.
-   *
-   * @since 0.16
-   */
-  @AutoValue
-  @Immutable
-  public abstract static class Bucket {
-
-    Bucket() {}
-
-    /**
-     * Creates a {@link Bucket}.
-     *
-     * @param count the number of values in each bucket of the histogram.
-     * @return a {@code Bucket}.
-     * @since 0.16
-     */
-    public static Bucket create(long count) {
-      Utils.checkArgument(count >= 0, "bucket count should be non-negative.");
-      return new AutoValue_Distribution_Bucket(count, null);
-    }
-
-    /**
-     * Creates a {@link Bucket} with an {@link Exemplar}.
-     *
-     * @param count the number of values in each bucket of the histogram.
-     * @param exemplar the {@code Exemplar} of this {@code Bucket}.
-     * @return a {@code Bucket}.
-     * @since 0.16
-     */
-    public static Bucket create(long count, Exemplar exemplar) {
-      Utils.checkArgument(count >= 0, "bucket count should be non-negative.");
-      Utils.checkNotNull(exemplar, "exemplar");
-      return new AutoValue_Distribution_Bucket(count, exemplar);
-    }
-
-    /**
-     * Returns the number of values in each bucket of the histogram.
-     *
-     * @return the number of values in each bucket of the histogram.
-     * @since 0.16
-     */
-    public abstract long getCount();
-
-    /**
-     * Returns the {@link Exemplar} associated with the {@link Bucket}, or {@code null} if there
-     * isn't one.
-     *
-     * @return the {@code Exemplar} associated with the {@code Bucket}, or {@code null} if there
-     *     isn't one.
-     * @since 0.16
-     */
-    @Nullable
-    public abstract Exemplar getExemplar();
-  }
-
-  /**
-   * An example point that may be used to annotate aggregated distribution values, associated with a
-   * histogram bucket.
-   *
-   * @since 0.16
-   */
-  @Immutable
-  @AutoValue
-  public abstract static class Exemplar {
-
-    Exemplar() {}
-
-    /**
-     * Returns value of the {@link Exemplar} point.
-     *
-     * @return value of the {@code Exemplar} point.
-     * @since 0.16
-     */
-    public abstract double getValue();
-
-    /**
-     * Returns the time that this {@link Exemplar}'s value was recorded.
-     *
-     * @return the time that this {@code Exemplar}'s value was recorded.
-     * @since 0.16
-     */
-    public abstract Timestamp getTimestamp();
-
-    /**
-     * Returns the contextual information about the example value, represented as a string map.
-     *
-     * @return the contextual information about the example value.
-     * @since 0.16
-     */
-    public abstract Map<String, String> getAttachments();
-
-    /**
-     * Creates an {@link Exemplar}.
-     *
-     * @param value value of the {@link Exemplar} point.
-     * @param timestamp the time that this {@code Exemplar}'s value was recorded.
-     * @param attachments the contextual information about the example value.
-     * @return an {@code Exemplar}.
-     * @since 0.16
-     */
-    public static Exemplar create(
-        double value, Timestamp timestamp, Map<String, String> attachments) {
-      Utils.checkNotNull(attachments, "attachments");
-      Map<String, String> attachmentsCopy =
-          Collections.unmodifiableMap(new HashMap<String, String>(attachments));
-      for (Entry<String, String> entry : attachmentsCopy.entrySet()) {
-        Utils.checkNotNull(entry.getKey(), "key of attachments");
-        Utils.checkNotNull(entry.getValue(), "value of attachments");
-      }
-      return new AutoValue_Distribution_Exemplar(value, timestamp, attachmentsCopy);
-    }
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelKey.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelKey.java
deleted file mode 100644
index d0c83e5e..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelKey.java
+++ /dev/null
@@ -1,62 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * The key of a {@code Label} associated with a {@code MetricDescriptor}.
- *
- * @since 0.15
- */
-@ExperimentalApi
-@Immutable
-@AutoValue
-public abstract class LabelKey {
-
-  LabelKey() {}
-
-  /**
-   * Creates a {@link LabelKey}.
-   *
-   * @param key the key of a {@code Label}.
-   * @param description a human-readable description of what this label key represents.
-   * @return a {@code LabelKey}.
-   * @since 0.15
-   */
-  public static LabelKey create(String key, String description) {
-    return new AutoValue_LabelKey(key, description);
-  }
-
-  /**
-   * Returns the key of this {@link LabelKey}.
-   *
-   * @return the key.
-   * @since 0.15
-   */
-  public abstract String getKey();
-
-  /**
-   * Returns the description of this {@link LabelKey}.
-   *
-   * @return the description.
-   * @since 0.15
-   */
-  public abstract String getDescription();
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelValue.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelValue.java
deleted file mode 100644
index 919b16a3..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelValue.java
+++ /dev/null
@@ -1,57 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * The value of a {@code Label} associated with a {@code TimeSeries}.
- *
- * @since 0.15
- */
-@ExperimentalApi
-@Immutable
-@AutoValue
-public abstract class LabelValue {
-
-  LabelValue() {}
-
-  /**
-   * Creates a {@link LabelValue}.
-   *
-   * @param value the value of a {@code Label}. {@code null} value indicates an unset {@code
-   *     LabelValue}.
-   * @return a {@code LabelValue}.
-   * @since 0.15
-   */
-  public static LabelValue create(@Nullable String value) {
-    return new AutoValue_LabelValue(value);
-  }
-
-  /**
-   * Returns the value of this {@link LabelValue}. Returns {@code null} if the value is unset and
-   * supposed to be ignored.
-   *
-   * @return the value.
-   * @since 0.15
-   */
-  @Nullable
-  public abstract String getValue();
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metric.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metric.java
deleted file mode 100644
index 56937e8d..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metric.java
+++ /dev/null
@@ -1,98 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.implcore.temporary.metrics.Value.ValueDistribution;
-import io.opencensus.implcore.temporary.metrics.Value.ValueDouble;
-import io.opencensus.implcore.temporary.metrics.Value.ValueLong;
-import io.opencensus.internal.Utils;
-import java.util.List;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * A {@link Metric} with one or more {@link TimeSeries}.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@Immutable
-@AutoValue
-public abstract class Metric {
-
-  Metric() {}
-
-  /**
-   * Creates a {@link Metric}.
-   *
-   * @param metricDescriptor the {@link MetricDescriptor}.
-   * @param timeSeriesList the {@link TimeSeries} list for this metric.
-   * @return a {@code Metric}.
-   * @since 0.16
-   */
-  public static Metric create(MetricDescriptor metricDescriptor, List<TimeSeries> timeSeriesList) {
-    checkTypeMatch(metricDescriptor.getType(), timeSeriesList);
-    return new AutoValue_Metric(metricDescriptor, timeSeriesList);
-  }
-
-  /**
-   * Returns the {@link MetricDescriptor} of this metric.
-   *
-   * @return the {@code MetricDescriptor} of this metric.
-   * @since 0.16
-   */
-  public abstract MetricDescriptor getMetricDescriptor();
-
-  /**
-   * Returns the {@link TimeSeries} list for this metric.
-   *
-   * <p>The type of the {@link TimeSeries#getPoints()} must match {@link MetricDescriptor.Type}.
-   *
-   * @return the {@code TimeSeriesList} for this metric.
-   * @since 0.16
-   */
-  public abstract List<TimeSeries> getTimeSeriesList();
-
-  private static void checkTypeMatch(MetricDescriptor.Type type, List<TimeSeries> timeSeriesList) {
-    for (TimeSeries timeSeries : timeSeriesList) {
-      for (Point point : timeSeries.getPoints()) {
-        Value value = point.getValue();
-        String valueClassName = "";
-        if (value.getClass().getSuperclass() != null) { // work around nullness check
-          // AutoValue classes should always have a super class.
-          valueClassName = value.getClass().getSuperclass().getSimpleName();
-        }
-        switch (type) {
-          case GAUGE_INT64:
-          case CUMULATIVE_INT64:
-            Utils.checkArgument(
-                value instanceof ValueLong, "Type mismatch: %s, %s.", type, valueClassName);
-            break;
-          case CUMULATIVE_DOUBLE:
-          case GAUGE_DOUBLE:
-            Utils.checkArgument(
-                value instanceof ValueDouble, "Type mismatch: %s, %s.", type, valueClassName);
-            break;
-          case CUMULATIVE_DISTRIBUTION:
-            Utils.checkArgument(
-                value instanceof ValueDistribution, "Type mismatch: %s, %s.", type, valueClassName);
-        }
-      }
-    }
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricDescriptor.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricDescriptor.java
deleted file mode 100644
index fb7265f1..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricDescriptor.java
+++ /dev/null
@@ -1,150 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.internal.Utils;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * {@link MetricDescriptor} defines a {@code Metric} type and its schema.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@Immutable
-@AutoValue
-public abstract class MetricDescriptor {
-
-  MetricDescriptor() {}
-
-  /**
-   * Creates a {@link MetricDescriptor}.
-   *
-   * @param name name of {@code MetricDescriptor}.
-   * @param description description of {@code MetricDescriptor}.
-   * @param unit the metric unit.
-   * @param type type of {@code MetricDescriptor}.
-   * @param labelKeys the label keys associated with the {@code MetricDescriptor}.
-   * @return a {@code MetricDescriptor}.
-   * @since 0.16
-   */
-  public static MetricDescriptor create(
-      String name, String description, String unit, Type type, List<LabelKey> labelKeys) {
-    Utils.checkNotNull(labelKeys, "labelKeys");
-    Utils.checkListElementNotNull(labelKeys, "labelKey");
-    return new AutoValue_MetricDescriptor(
-        name,
-        description,
-        unit,
-        type,
-        Collections.unmodifiableList(new ArrayList<LabelKey>(labelKeys)));
-  }
-
-  /**
-   * Returns the metric descriptor name.
-   *
-   * @return the metric descriptor name.
-   * @since 0.16
-   */
-  public abstract String getName();
-
-  /**
-   * Returns the description of this metric descriptor.
-   *
-   * @return the description of this metric descriptor.
-   * @since 0.16
-   */
-  public abstract String getDescription();
-
-  /**
-   * Returns the unit of this metric descriptor.
-   *
-   * @return the unit of this metric descriptor.
-   * @since 0.16
-   */
-  public abstract String getUnit();
-
-  /**
-   * Returns the type of this metric descriptor.
-   *
-   * @return the type of this metric descriptor.
-   * @since 0.16
-   */
-  public abstract Type getType();
-
-  /**
-   * Returns the label keys associated with this metric descriptor.
-   *
-   * @return the label keys associated with this metric descriptor.
-   * @since 0.16
-   */
-  public abstract List<LabelKey> getLabelKeys();
-
-  /**
-   * The kind of metric. It describes how the data is reported.
-   *
-   * <p>A gauge is an instantaneous measurement of a value.
-   *
-   * <p>A cumulative measurement is a value accumulated over a time interval. In a time series,
-   * cumulative measurements should have the same start time and increasing end times, until an
-   * event resets the cumulative value to zero and sets a new start time for the following points.
-   *
-   * @since 0.16
-   */
-  public enum Type {
-
-    /**
-     * An instantaneous measurement of an int64 value.
-     *
-     * @since 0.16
-     */
-    GAUGE_INT64,
-
-    /**
-     * An instantaneous measurement of a double value.
-     *
-     * @since 0.16
-     */
-    GAUGE_DOUBLE,
-
-    /**
-     * An cumulative measurement of an int64 value.
-     *
-     * @since 0.16
-     */
-    CUMULATIVE_INT64,
-
-    /**
-     * An cumulative measurement of a double value.
-     *
-     * @since 0.16
-     */
-    CUMULATIVE_DOUBLE,
-
-    /**
-     * An cumulative measurement of a distribution value.
-     *
-     * @since 0.16
-     */
-    CUMULATIVE_DISTRIBUTION,
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricProducer.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricProducer.java
deleted file mode 100644
index cb56d3dc..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricProducer.java
+++ /dev/null
@@ -1,40 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
-import java.util.Collection;
-
-/**
- * A {@link io.opencensus.implcore.temporary.metrics.Metric} producer that can be registered for
- * exporting using {@link MetricProducerManager}.
- *
- * <p>All implementation MUST be thread-safe.
- */
-@ExperimentalApi
-public abstract class MetricProducer {
-
-  /**
-   * Returns a collection of produced {@link io.opencensus.implcore.temporary.metrics.Metric}s to be
-   * exported.
-   *
-   * @return a collection of produced {@link io.opencensus.implcore.temporary.metrics.Metric}s to be
-   *     exported.
-   */
-  public abstract Collection<Metric> getMetrics();
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricRegistry.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricRegistry.java
deleted file mode 100644
index 851fdba5..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricRegistry.java
+++ /dev/null
@@ -1,117 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.common.ToDoubleFunction;
-import io.opencensus.common.ToLongFunction;
-import io.opencensus.internal.Utils;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.LinkedHashMap;
-
-/**
- * Creates and manages your application's set of metrics. Exporters use the metric registry to
- * iterate over the set of metrics instrumenting your application, and then further export each
- * metric to the backend of choice.
- *
- * @since 0.16
- */
-@ExperimentalApi
-public abstract class MetricRegistry extends MetricProducer {
-  /**
-   * Build a new long gauge to be added to the registry.
-   *
-   * <p>Must be called only once.
-   *
-   * @param name the name of the metric.
-   * @param description the description of the metric.
-   * @param unit the unit of the metric.
-   * @param obj the function argument.
-   * @param function the function to be called.
-   * @since 0.16 @ExperimentalApi
-   */
-  public abstract <T> void addLongGauge(
-      String name,
-      String description,
-      String unit,
-      LinkedHashMap<LabelKey, LabelValue> labels,
-      T obj,
-      ToLongFunction<T> function);
-
-  /**
-   * Build a new double gauge to be added to the registry.
-   *
-   * <p>Must be called only once.
-   *
-   * @param name the name of the metric.
-   * @param description the description of the metric.
-   * @param unit the unit of the metric.
-   * @param obj the function argument.
-   * @param function the function to be called.
-   * @since 0.16 @ExperimentalApi
-   */
-  public abstract <T> void addDoubleGauge(
-      String name,
-      String description,
-      String unit,
-      LinkedHashMap<LabelKey, LabelValue> labels,
-      T obj,
-      ToDoubleFunction<T> function);
-
-  static MetricRegistry newNoopMetricRegistry() {
-    return new NoopMetricRegistry();
-  }
-
-  private static final class NoopMetricRegistry extends MetricRegistry {
-
-    @Override
-    public <T> void addLongGauge(
-        String name,
-        String description,
-        String unit,
-        LinkedHashMap<LabelKey, LabelValue> labels,
-        T obj,
-        ToLongFunction<T> function) {
-      Utils.checkNotNull(name, "name");
-      Utils.checkNotNull(description, "description");
-      Utils.checkNotNull(unit, "unit");
-      Utils.checkNotNull(labels, "labels");
-      Utils.checkNotNull(function, "function");
-    }
-
-    @Override
-    public <T> void addDoubleGauge(
-        String name,
-        String description,
-        String unit,
-        LinkedHashMap<LabelKey, LabelValue> labels,
-        T obj,
-        ToDoubleFunction<T> function) {
-      Utils.checkNotNull(name, "name");
-      Utils.checkNotNull(description, "description");
-      Utils.checkNotNull(unit, "unit");
-      Utils.checkNotNull(labels, "labels");
-      Utils.checkNotNull(function, "function");
-    }
-
-    @Override
-    public Collection<Metric> getMetrics() {
-      return Collections.emptyList();
-    }
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metrics.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metrics.java
deleted file mode 100644
index cf4b3e63..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metrics.java
+++ /dev/null
@@ -1,96 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
-import io.opencensus.internal.DefaultVisibilityForTesting;
-import io.opencensus.internal.Provider;
-import java.util.logging.Level;
-import java.util.logging.Logger;
-import javax.annotation.Nullable;
-
-/**
- * Class for accessing the default {@link MetricsComponent}.
- *
- * @since 0.16
- */
-@ExperimentalApi
-public final class Metrics {
-  private static final Logger logger = Logger.getLogger(Metrics.class.getName());
-  private static final MetricsComponent metricsComponent =
-      loadMetricsComponent(MetricsComponent.class.getClassLoader());
-
-  /**
-   * Returns the global {@link ExportComponent}.
-   *
-   * @return the global {@code ExportComponent}.
-   * @since 0.16
-   */
-  public static ExportComponent getExportComponent() {
-    return metricsComponent.getExportComponent();
-  }
-
-  /**
-   * Returns the global {@link MetricRegistry}.
-   *
-   * <p>This {@code MetricRegistry} is already added to the global {@link
-   * io.opencensus.implcore.temporary.metrics.export.MetricProducerManager}.
-   *
-   * @return the global {@code MetricRegistry}.
-   * @since 0.16
-   */
-  public static MetricRegistry getMetricRegistry() {
-    return metricsComponent.getMetricRegistry();
-  }
-
-  // Any provider that may be used for MetricsComponent can be added here.
-  @DefaultVisibilityForTesting
-  static MetricsComponent loadMetricsComponent(@Nullable ClassLoader classLoader) {
-    try {
-      // Call Class.forName with literal string name of the class to help shading tools.
-      return Provider.createInstance(
-          Class.forName(
-              "io.opencensus.impl.metrics.MetricsComponentImpl", /*initialize=*/ true, classLoader),
-          MetricsComponent.class);
-    } catch (ClassNotFoundException e) {
-      logger.log(
-          Level.FINE,
-          "Couldn't load full implementation for MetricsComponent, now trying to load lite "
-              + "implementation.",
-          e);
-    }
-    try {
-      // Call Class.forName with literal string name of the class to help shading tools.
-      return Provider.createInstance(
-          Class.forName(
-              "io.opencensus.impllite.metrics.MetricsComponentImplLite",
-              /*initialize=*/ true,
-              classLoader),
-          MetricsComponent.class);
-    } catch (ClassNotFoundException e) {
-      logger.log(
-          Level.FINE,
-          "Couldn't load lite implementation for MetricsComponent, now using default "
-              + "implementation for MetricsComponent.",
-          e);
-    }
-    return MetricsComponent.newNoopMetricsComponent();
-  }
-
-  private Metrics() {}
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricsComponent.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricsComponent.java
deleted file mode 100644
index e578f8b6..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricsComponent.java
+++ /dev/null
@@ -1,71 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
-
-/**
- * Class that holds the implementation instance for {@link ExportComponent}.
- *
- * @since 0.16
- */
-@ExperimentalApi
-public abstract class MetricsComponent {
-
-  /**
-   * Returns the {@link ExportComponent} with the provided implementation. If no implementation is
-   * provided then no-op implementations will be used.
-   *
-   * @return the {@link ExportComponent} implementation.
-   * @since 0.16
-   */
-  public abstract ExportComponent getExportComponent();
-
-  /**
-   * Returns the {@link MetricRegistry} with the provided implementation.
-   *
-   * @return the {@link MetricRegistry} implementation.
-   * @since 0.16
-   */
-  public abstract MetricRegistry getMetricRegistry();
-
-  /**
-   * Returns an instance that contains no-op implementations for all the instances.
-   *
-   * @return an instance that contains no-op implementations for all the instances.
-   */
-  static MetricsComponent newNoopMetricsComponent() {
-    return new NoopMetricsComponent();
-  }
-
-  private static final class NoopMetricsComponent extends MetricsComponent {
-    private static final ExportComponent EXPORT_COMPONENT =
-        ExportComponent.newNoopExportComponent();
-    private static final MetricRegistry METRIC_REGISTRY = MetricRegistry.newNoopMetricRegistry();
-
-    @Override
-    public ExportComponent getExportComponent() {
-      return EXPORT_COMPONENT;
-    }
-
-    @Override
-    public MetricRegistry getMetricRegistry() {
-      return METRIC_REGISTRY;
-    }
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Point.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Point.java
deleted file mode 100644
index e7337f59..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Point.java
+++ /dev/null
@@ -1,63 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.common.Timestamp;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * A timestamped measurement of a {@code TimeSeries}.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@AutoValue
-@Immutable
-public abstract class Point {
-
-  Point() {}
-
-  /**
-   * Creates a {@link Point}.
-   *
-   * @param value the {@link Value} of this {@link Point}.
-   * @param timestamp the {@link Timestamp} when this {@link Point} was recorded.
-   * @return a {@code Point}.
-   * @since 0.16
-   */
-  public static Point create(Value value, Timestamp timestamp) {
-    return new AutoValue_Point(value, timestamp);
-  }
-
-  /**
-   * Returns the {@link Value}.
-   *
-   * @return the {@code Value}.
-   * @since 0.16
-   */
-  public abstract Value getValue();
-
-  /**
-   * Returns the {@link Timestamp} when this {@link Point} was recorded.
-   *
-   * @return the {@code Timestamp}.
-   * @since 0.16
-   */
-  public abstract Timestamp getTimestamp();
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/TimeSeries.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/TimeSeries.java
deleted file mode 100644
index f149d06d..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/TimeSeries.java
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.common.Timestamp;
-import io.opencensus.internal.Utils;
-import java.util.ArrayList;
-import java.util.Collections;
-import java.util.List;
-import javax.annotation.Nullable;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * A collection of data points that describes the time-varying values of a {@code Metric}.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@Immutable
-@AutoValue
-public abstract class TimeSeries {
-
-  TimeSeries() {}
-
-  /**
-   * Creates a {@link TimeSeries}.
-   *
-   * @param labelValues the {@code LabelValue}s that uniquely identify this {@code TimeSeries}.
-   * @param points the data {@code Point}s of this {@code TimeSeries}.
-   * @param startTimestamp the start {@code Timestamp} of this {@code TimeSeries}. Must be non-null
-   *     for cumulative {@code Point}s.
-   * @return a {@code TimeSeries}.
-   * @since 0.16
-   */
-  public static TimeSeries create(
-      List<LabelValue> labelValues, List<Point> points, @Nullable Timestamp startTimestamp) {
-    // Fail fast on null lists to prevent NullPointerException when copying the lists.
-    Utils.checkNotNull(labelValues, "labelValues");
-    Utils.checkNotNull(points, "points");
-    Utils.checkListElementNotNull(labelValues, "labelValue");
-    Utils.checkListElementNotNull(points, "point");
-    return new AutoValue_TimeSeries(
-        Collections.unmodifiableList(new ArrayList<LabelValue>(labelValues)),
-        Collections.unmodifiableList(new ArrayList<Point>(points)),
-        startTimestamp);
-  }
-
-  /**
-   * Returns the set of {@link LabelValue}s that uniquely identify this {@link TimeSeries}.
-   *
-   * <p>Apply to all {@link Point}s.
-   *
-   * <p>The order of {@link LabelValue}s must match that of {@link LabelKey}s in the {@code
-   * MetricDescriptor}.
-   *
-   * @return the {@code LabelValue}s.
-   * @since 0.16
-   */
-  public abstract List<LabelValue> getLabelValues();
-
-  /**
-   * Returns the data {@link Point}s of this {@link TimeSeries}.
-   *
-   * @return the data {@code Point}s.
-   * @since 0.16
-   */
-  public abstract List<Point> getPoints();
-
-  /**
-   * Returns the start {@link Timestamp} of this {@link TimeSeries} if the {@link Point}s are
-   * cumulative, or {@code null} if the {@link Point}s are gauge.
-   *
-   * @return the start {@code Timestamp} or {@code null}.
-   * @since 0.16
-   */
-  @Nullable
-  public abstract Timestamp getStartTimestamp();
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Value.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Value.java
deleted file mode 100644
index a17c5135..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Value.java
+++ /dev/null
@@ -1,196 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics;
-
-import com.google.auto.value.AutoValue;
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.common.Function;
-import javax.annotation.concurrent.Immutable;
-
-/**
- * The actual point value for a {@link Point}.
- *
- * <p>Currently there are three types of {@link Value}:
- *
- * <ul>
- *   <li>{@code double}
- *   <li>{@code long}
- *   <li>{@link Distribution}
- * </ul>
- *
- * <p>Each {@link Point} contains exactly one of the three {@link Value} types.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@Immutable
-public abstract class Value {
-
-  Value() {}
-
-  /**
-   * Returns a double {@link Value}.
-   *
-   * @param value value in double.
-   * @return a double {@code Value}.
-   * @since 0.16
-   */
-  public static Value doubleValue(double value) {
-    return ValueDouble.create(value);
-  }
-
-  /**
-   * Returns a long {@link Value}.
-   *
-   * @param value value in long.
-   * @return a long {@code Value}.
-   * @since 0.16
-   */
-  public static Value longValue(long value) {
-    return ValueLong.create(value);
-  }
-
-  /**
-   * Returns a {@link Distribution} {@link Value}.
-   *
-   * @param value value in {@link Distribution}.
-   * @return a {@code Distribution} {@code Value}.
-   * @since 0.16
-   */
-  public static Value distributionValue(Distribution value) {
-    return ValueDistribution.create(value);
-  }
-
-  /**
-   * Applies the given match function to the underlying data type.
-   *
-   * @since 0.16
-   */
-  public abstract <T> T match(
-      Function<? super Double, T> doubleFunction,
-      Function<? super Long, T> longFunction,
-      Function<? super Distribution, T> distributionFunction,
-      Function<? super Value, T> defaultFunction);
-
-  /** A 64-bit double-precision floating-point {@link Value}. */
-  @AutoValue
-  @Immutable
-  abstract static class ValueDouble extends Value {
-
-    ValueDouble() {}
-
-    @Override
-    public final <T> T match(
-        Function<? super Double, T> doubleFunction,
-        Function<? super Long, T> longFunction,
-        Function<? super Distribution, T> distributionFunction,
-        Function<? super Value, T> defaultFunction) {
-      return doubleFunction.apply(getValue());
-    }
-
-    /**
-     * Creates a {@link ValueDouble}.
-     *
-     * @param value the value in double.
-     * @return a {@code ValueDouble}.
-     */
-    static ValueDouble create(double value) {
-      return new AutoValue_Value_ValueDouble(value);
-    }
-
-    /**
-     * Returns the double value.
-     *
-     * @return the double value.
-     */
-    abstract double getValue();
-  }
-
-  /** A 64-bit integer {@link Value}. */
-  @AutoValue
-  @Immutable
-  abstract static class ValueLong extends Value {
-
-    ValueLong() {}
-
-    @Override
-    public final <T> T match(
-        Function<? super Double, T> doubleFunction,
-        Function<? super Long, T> longFunction,
-        Function<? super Distribution, T> distributionFunction,
-        Function<? super Value, T> defaultFunction) {
-      return longFunction.apply(getValue());
-    }
-
-    /**
-     * Creates a {@link ValueLong}.
-     *
-     * @param value the value in long.
-     * @return a {@code ValueLong}.
-     */
-    static ValueLong create(long value) {
-      return new AutoValue_Value_ValueLong(value);
-    }
-
-    /**
-     * Returns the long value.
-     *
-     * @return the long value.
-     */
-    abstract long getValue();
-  }
-
-  /**
-   * {@link ValueDistribution} contains summary statistics for a population of values. It optionally
-   * contains a histogram representing the distribution of those values across a set of buckets.
-   */
-  @AutoValue
-  @Immutable
-  abstract static class ValueDistribution extends Value {
-
-    ValueDistribution() {}
-
-    @Override
-    public final <T> T match(
-        Function<? super Double, T> doubleFunction,
-        Function<? super Long, T> longFunction,
-        Function<? super Distribution, T> distributionFunction,
-        Function<? super Value, T> defaultFunction) {
-      return distributionFunction.apply(getValue());
-    }
-
-    /**
-     * Creates a {@link ValueDistribution}.
-     *
-     * @param value the {@link Distribution} value.
-     * @return a {@code ValueDistribution}.
-     */
-    static ValueDistribution create(Distribution value) {
-      return new AutoValue_Value_ValueDistribution(value);
-    }
-
-    /**
-     * Returns the {@link Distribution} value.
-     *
-     * @return the {@code Distribution} value.
-     */
-    abstract Distribution getValue();
-  }
-
-  // TODO(songya): Add support for Summary type.
-  // This is an aggregation that produces percentiles directly.
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/ExportComponent.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/ExportComponent.java
deleted file mode 100644
index fd299976..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/ExportComponent.java
+++ /dev/null
@@ -1,60 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics.export;
-
-import io.opencensus.common.ExperimentalApi;
-
-/**
- * Class that holds the implementation instance for {@link MetricProducerManager}.
- *
- * <p>Unless otherwise noted all methods (on component) results are cacheable.
- *
- * @since 0.16
- */
-@ExperimentalApi
-public abstract class ExportComponent {
-  /**
-   * Returns the no-op implementation of the {@code ExportComponent}.
-   *
-   * @return the no-op implementation of the {@code ExportComponent}.
-   * @since 0.16
-   */
-  public static ExportComponent newNoopExportComponent() {
-    return new NoopExportComponent();
-  }
-
-  /**
-   * Returns the global {@link MetricProducerManager} which can be used to register handlers to
-   * export all the recorded metrics.
-   *
-   * @return the implementation of the {@code MetricExporter} or no-op if no implementation linked
-   *     in the binary.
-   * @since 0.16
-   */
-  public abstract MetricProducerManager getMetricProducerManager();
-
-  private static final class NoopExportComponent extends ExportComponent {
-
-    private static final MetricProducerManager METRIC_PRODUCER_MANAGER =
-        MetricProducerManager.newNoopMetricProducerManager();
-
-    @Override
-    public MetricProducerManager getMetricProducerManager() {
-      return METRIC_PRODUCER_MANAGER;
-    }
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManager.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManager.java
deleted file mode 100644
index b28b094d..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManager.java
+++ /dev/null
@@ -1,89 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.opencensus.implcore.temporary.metrics.export;
-
-import io.opencensus.common.ExperimentalApi;
-import io.opencensus.implcore.temporary.metrics.MetricProducer;
-import io.opencensus.internal.Utils;
-import java.util.Collections;
-import java.util.Set;
-import javax.annotation.concurrent.ThreadSafe;
-
-/**
- * Keeps a set of {@link MetricProducer} that is used by exporters to determine the metrics that
- * need to be exported.
- *
- * @since 0.16
- */
-@ExperimentalApi
-@ThreadSafe
-public abstract class MetricProducerManager {
-
-  /**
-   * Adds the {@link MetricProducer} to the manager if it is not already present.
-   *
-   * @param metricProducer the {@code MetricProducer} to be added to the manager.
-   * @since 0.16
-   */
-  public abstract void add(MetricProducer metricProducer);
-
-  /**
-   * Removes the {@link MetricProducer} to the manager if it is present.
-   *
-   * @param metricProducer the {@code MetricProducer} to be removed from the manager.
-   * @since 0.16
-   */
-  public abstract void remove(MetricProducer metricProducer);
-
-  /**
-   * Returns all registered {@link MetricProducer}s that should be exported.
-   *
-   * <p>This method should be used by any metrics exporter that automatically exports data for
-   * {@code MetricProducer} registered with the {@code MetricProducerManager}.
-   *
-   * @return all registered {@code MetricProducer}s that should be exported.
-   * @since 0.16
-   */
-  public abstract Set<MetricProducer> getAllMetricProducer();
-
-  /**
-   * Returns a no-op implementation for {@link MetricProducerManager}.
-   *
-   * @return a no-op implementation for {@code MetricProducerManager}.
-   */
-  static MetricProducerManager newNoopMetricProducerManager() {
-    return new NoopMetricProducerManager();
-  }
-
-  private static final class NoopMetricProducerManager extends MetricProducerManager {
-
-    @Override
-    public void add(MetricProducer metricProducer) {
-      Utils.checkNotNull(metricProducer, "metricProducer");
-    }
-
-    @Override
-    public void remove(MetricProducer metricProducer) {
-      Utils.checkNotNull(metricProducer, "metricProducer");
-    }
-
-    @Override
-    public Set<MetricProducer> getAllMetricProducer() {
-      return Collections.emptySet();
-    }
-  }
-}
diff --git a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/package-info.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/package-info.java
deleted file mode 100644
index f768380f..00000000
--- a/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/package-info.java
+++ /dev/null
@@ -1,32 +0,0 @@
-/*
- * Copyright 2018, OpenCensus Authors
- *
- * 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
- *
- *     http://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.
- */
-
-/**
- * This package describes the Metrics data model. Metrics are a data model for what stats exporters
- * take as input. This data model may eventually become the wire format for metrics.
- *
- * <p>WARNING: Currently all the public classes under this package are marked as {@link
- * io.opencensus.common.ExperimentalApi}. The classes and APIs under {@link
- * io.opencensus.implcore.temporary.metrics} are likely to get backwards-incompatible updates in the
- * future. DO NOT USE except for experimental purposes.
- *
- * <p>Please see
- * https://github.com/census-instrumentation/opencensus-specs/blob/master/stats/Metrics.md and
- * https://github.com/census-instrumentation/opencensus-proto/blob/master/opencensus/proto/stats/metrics/metrics.proto
- * for more details.
- */
-@io.opencensus.common.ExperimentalApi
-package io.opencensus.implcore.temporary.metrics;