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

The "metrics" package isn't ready to be released yet, so this commit moves it
out of the API artifact.  The package can still be accessed by the stats
implementation in impl_core/.  This commit can be reverted once the package is
ready to be exposed.  The moved package names also contain "temporary" so that
there is no possibility of class name conflicts between different versions of
opencensus-api and opencensus-impl-core.  For example,
io.opencensus.metrics.export is renamed to
io.opencensus.implcore.temporary.metrics.export.

52 files changed, 135 insertions, 132 deletions

diff --git a/api/src/main/java/io/opencensus/common/ToDoubleFunction.java b/api/src/main/java/io/opencensus/common/ToDoubleFunction.java
index eac85793..415f8ca9 100644
--- a/api/src/main/java/io/opencensus/common/ToDoubleFunction.java
+++ b/api/src/main/java/io/opencensus/common/ToDoubleFunction.java
@@ -17,7 +17,7 @@
 package io.opencensus.common;
 
 /**
- * Represents a function that produces a double-valued result. See {@link
+ * Represents a function that produces a double-valued result. See {@code
  * io.opencensus.metrics.MetricRegistry} for an example of its use.
  *
  * <p>Note: This class is based on the java.util.ToDoubleFunction class added in Java 1.8. We cannot
diff --git a/api/src/main/java/io/opencensus/common/ToLongFunction.java b/api/src/main/java/io/opencensus/common/ToLongFunction.java
index 26a27b18..727a8b44 100644
--- a/api/src/main/java/io/opencensus/common/ToLongFunction.java
+++ b/api/src/main/java/io/opencensus/common/ToLongFunction.java
@@ -17,7 +17,7 @@
 package io.opencensus.common;
 
 /**
- * Represents a function that produces a long-valued result. See {@link
+ * Represents a function that produces a long-valued result. See {@code
  * io.opencensus.metrics.MetricRegistry} for an example of its use.
  *
  * <p>Note: This class is based on the java.util.ToLongFunction class added in Java 1.8. We cannot
diff --git a/buildscripts/import-control.xml b/buildscripts/import-control.xml
index 938b57ee..b89f9f27 100644
--- a/buildscripts/import-control.xml
+++ b/buildscripts/import-control.xml
@@ -38,10 +38,10 @@ General guidelines on imports:
     <allow pkg="io.opencensus.internal"/>
     <allow pkg="io.opencensus.tags"/>
   </subpackage>
-  <subpackage name="metrics">
+  <subpackage name="implcore.temporary.metrics">
     <allow pkg="io.opencensus.internal"/>
     <allow pkg="io.opencensus.common"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
   </subpackage>
   <subpackage name="stats">
     <allow pkg="io.opencensus.common"/>
@@ -182,7 +182,7 @@ General guidelines on imports:
     <allow pkg="com.google.common"/>
     <allow pkg="io.opencensus.common"/>
     <allow pkg="io.opencensus.implcore"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
     <allow pkg="io.opencensus.stats"/>
     <allow pkg="io.opencensus.tags"/>
     <allow pkg="io.opencensus.trace"/>
@@ -192,7 +192,7 @@ General guidelines on imports:
     <allow pkg="io.opencensus.common"/>
     <allow pkg="io.opencensus.impl"/>
     <allow pkg="io.opencensus.implcore"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
     <allow pkg="io.opencensus.stats"/>
     <allow pkg="io.opencensus.tags"/>
     <allow pkg="io.opencensus.trace"/>
@@ -201,7 +201,7 @@ General guidelines on imports:
     <allow pkg="io.opencensus.common"/>
     <allow pkg="io.opencensus.implcore"/>
     <allow pkg="io.opencensus.impllite"/>
-    <allow pkg="io.opencensus.metrics"/>
+    <allow pkg="io.opencensus.implcore.temporary.metrics"/>
     <allow pkg="io.opencensus.stats"/>
     <allow pkg="io.opencensus.tags"/>
     <allow pkg="io.opencensus.trace"/>
diff --git a/impl/src/main/java/io/opencensus/impl/metrics/MetricsComponentImpl.java b/impl/src/main/java/io/opencensus/impl/metrics/MetricsComponentImpl.java
index 53c354f1..2d84bace 100644
--- a/impl/src/main/java/io/opencensus/impl/metrics/MetricsComponentImpl.java
+++ b/impl/src/main/java/io/opencensus/impl/metrics/MetricsComponentImpl.java
@@ -18,7 +18,7 @@ package io.opencensus.impl.metrics;
 
 import io.opencensus.implcore.common.MillisClock;
 import io.opencensus.implcore.metrics.MetricsComponentImplBase;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 
 /** Implementation of {@link MetricsComponent}. */
 public final class MetricsComponentImpl extends MetricsComponentImplBase {
diff --git a/impl/src/test/java/io/opencensus/impl/metrics/MetricsTest.java b/impl/src/test/java/io/opencensus/impl/metrics/MetricsTest.java
index 439933de..b48c0921 100644
--- a/impl/src/test/java/io/opencensus/impl/metrics/MetricsTest.java
+++ b/impl/src/test/java/io/opencensus/impl/metrics/MetricsTest.java
@@ -20,8 +20,8 @@ import static com.google.common.truth.Truth.assertThat;
 
 import io.opencensus.implcore.metrics.MetricRegistryImpl;
 import io.opencensus.implcore.metrics.export.ExportComponentImpl;
-import io.opencensus.metrics.Metrics;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.Metrics;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
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 e6498066..371c762d 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.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 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 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 f3daaef7..294c9207 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.metrics.LabelKey;
-import io.opencensus.metrics.LabelValue;
-import io.opencensus.metrics.Metric;
-import io.opencensus.metrics.MetricRegistry;
+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 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 46ad028c..40f8fbe5 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.metrics.MetricRegistry;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.MetricRegistry;
+import io.opencensus.implcore.temporary.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 173c3aec..18362646 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.metrics.export.ExportComponent;
-import io.opencensus.metrics.export.MetricProducerManager;
+import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
+import io.opencensus.implcore.temporary.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 fc9db5c1..50d15534 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.metrics.MetricProducer;
-import io.opencensus.metrics.export.MetricProducerManager;
+import io.opencensus.implcore.temporary.metrics.MetricProducer;
+import io.opencensus.implcore.temporary.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 2e28991c..8ca7bca6 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.metrics.Metric;
+import io.opencensus.implcore.temporary.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 31ef6be1..6677ef6b 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.metrics.Metric;
-import io.opencensus.metrics.MetricProducer;
+import io.opencensus.implcore.temporary.metrics.Metric;
+import io.opencensus.implcore.temporary.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 cd1e5364..20568514 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.metrics.LabelKey;
-import io.opencensus.metrics.LabelValue;
-import io.opencensus.metrics.MetricDescriptor;
-import io.opencensus.metrics.MetricDescriptor.Type;
+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.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 a41850d2..e4b33e46 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.metrics.Distribution;
-import io.opencensus.metrics.Point;
-import io.opencensus.metrics.Value;
+import io.opencensus.implcore.temporary.metrics.Distribution;
+import io.opencensus.implcore.temporary.metrics.Point;
+import io.opencensus.implcore.temporary.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 7368a161..a0e9fd3b 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.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.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.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 72791f04..1456746f 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.metrics.MetricProducer;
-import io.opencensus.metrics.Metrics;
+import io.opencensus.implcore.temporary.metrics.MetricProducer;
+import io.opencensus.implcore.temporary.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 a58b9a5e..0fb78480 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.metrics.Metric;
+import io.opencensus.implcore.temporary.metrics.Metric;
 import io.opencensus.stats.View;
 import io.opencensus.stats.ViewData;
 import io.opencensus.tags.TagContext;
diff --git a/api/src/main/java/io/opencensus/metrics/Distribution.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Distribution.java
index bdea7762..4e1d1553 100644
--- a/api/src/main/java/io/opencensus/metrics/Distribution.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Distribution.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/LabelKey.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelKey.java
index 01ef0b55..d0c83e5e 100644
--- a/api/src/main/java/io/opencensus/metrics/LabelKey.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelKey.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/LabelValue.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelValue.java
index e81b63d2..919b16a3 100644
--- a/api/src/main/java/io/opencensus/metrics/LabelValue.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/LabelValue.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/Metric.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metric.java
index fa0018b3..56937e8d 100644
--- a/api/src/main/java/io/opencensus/metrics/Metric.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metric.java
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+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 io.opencensus.metrics.Value.ValueDistribution;
-import io.opencensus.metrics.Value.ValueDouble;
-import io.opencensus.metrics.Value.ValueLong;
 import java.util.List;
 import javax.annotation.concurrent.Immutable;
 
diff --git a/api/src/main/java/io/opencensus/metrics/MetricDescriptor.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricDescriptor.java
index 4558446a..fb7265f1 100644
--- a/api/src/main/java/io/opencensus/metrics/MetricDescriptor.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricDescriptor.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/MetricProducer.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricProducer.java
index 38b5d571..cb56d3dc 100644
--- a/api/src/main/java/io/opencensus/metrics/MetricProducer.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricProducer.java
@@ -14,15 +14,15 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import io.opencensus.common.ExperimentalApi;
-import io.opencensus.metrics.export.MetricProducerManager;
+import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
 import java.util.Collection;
 
 /**
- * A {@link io.opencensus.metrics.Metric} producer that can be registered for exporting using {@link
- * MetricProducerManager}.
+ * 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.
  */
@@ -30,9 +30,11 @@ import java.util.Collection;
 public abstract class MetricProducer {
 
   /**
-   * Returns a collection of produced {@link io.opencensus.metrics.Metric}s to be exported.
+   * Returns a collection of produced {@link io.opencensus.implcore.temporary.metrics.Metric}s to be
+   * exported.
    *
-   * @return a collection of produced {@link io.opencensus.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/api/src/main/java/io/opencensus/metrics/MetricRegistry.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricRegistry.java
index ae4d90b0..851fdba5 100644
--- a/api/src/main/java/io/opencensus/metrics/MetricRegistry.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricRegistry.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import io.opencensus.common.ExperimentalApi;
 import io.opencensus.common.ToDoubleFunction;
diff --git a/api/src/main/java/io/opencensus/metrics/Metrics.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metrics.java
index 521fbd08..cf4b3e63 100644
--- a/api/src/main/java/io/opencensus/metrics/Metrics.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Metrics.java
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+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 io.opencensus.metrics.export.ExportComponent;
 import java.util.logging.Level;
 import java.util.logging.Logger;
 import javax.annotation.Nullable;
@@ -49,7 +49,7 @@ public final class Metrics {
    * Returns the global {@link MetricRegistry}.
    *
    * <p>This {@code MetricRegistry} is already added to the global {@link
-   * io.opencensus.metrics.export.MetricProducerManager}.
+   * io.opencensus.implcore.temporary.metrics.export.MetricProducerManager}.
    *
    * @return the global {@code MetricRegistry}.
    * @since 0.16
diff --git a/api/src/main/java/io/opencensus/metrics/MetricsComponent.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricsComponent.java
index 08d954ef..e578f8b6 100644
--- a/api/src/main/java/io/opencensus/metrics/MetricsComponent.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/MetricsComponent.java
@@ -14,10 +14,10 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import io.opencensus.common.ExperimentalApi;
-import io.opencensus.metrics.export.ExportComponent;
+import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
 
 /**
  * Class that holds the implementation instance for {@link ExportComponent}.
diff --git a/api/src/main/java/io/opencensus/metrics/Point.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Point.java
index e66b273d..e7337f59 100644
--- a/api/src/main/java/io/opencensus/metrics/Point.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Point.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/TimeSeries.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/TimeSeries.java
index c62b6b72..f149d06d 100644
--- a/api/src/main/java/io/opencensus/metrics/TimeSeries.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/TimeSeries.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/Value.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Value.java
index c8fe48f8..a17c5135 100644
--- a/api/src/main/java/io/opencensus/metrics/Value.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/Value.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import com.google.auto.value.AutoValue;
 import io.opencensus.common.ExperimentalApi;
diff --git a/api/src/main/java/io/opencensus/metrics/export/ExportComponent.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/ExportComponent.java
index bab65d13..fd299976 100644
--- a/api/src/main/java/io/opencensus/metrics/export/ExportComponent.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/ExportComponent.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics.export;
+package io.opencensus.implcore.temporary.metrics.export;
 
 import io.opencensus.common.ExperimentalApi;
 
diff --git a/api/src/main/java/io/opencensus/metrics/export/MetricProducerManager.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManager.java
index c5acf174..b28b094d 100644
--- a/api/src/main/java/io/opencensus/metrics/export/MetricProducerManager.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManager.java
@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics.export;
+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 io.opencensus.metrics.MetricProducer;
 import java.util.Collections;
 import java.util.Set;
 import javax.annotation.concurrent.ThreadSafe;
diff --git a/api/src/main/java/io/opencensus/metrics/package-info.java b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/package-info.java
index 33eadf0c..f768380f 100644
--- a/api/src/main/java/io/opencensus/metrics/package-info.java
+++ b/impl_core/src/main/java/io/opencensus/implcore/temporary/metrics/package-info.java
@@ -19,9 +19,9 @@
  * 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.metrics}
- * are likely to get backwards-incompatible updates in the future. DO NOT USE except for
- * experimental purposes.
+ * 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
@@ -29,4 +29,4 @@
  * for more details.
  */
 @io.opencensus.common.ExperimentalApi
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
diff --git a/impl_core/src/test/java/io/opencensus/implcore/metrics/GaugeTest.java b/impl_core/src/test/java/io/opencensus/implcore/metrics/GaugeTest.java
index e1c17876..6a2ed63d 100644
--- a/impl_core/src/test/java/io/opencensus/implcore/metrics/GaugeTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/metrics/GaugeTest.java
@@ -23,14 +23,14 @@ 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.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 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.testing.common.TestClock;
 import java.util.Collections;
 import java.util.List;
diff --git a/impl_core/src/test/java/io/opencensus/implcore/metrics/MetricRegistryImplTest.java b/impl_core/src/test/java/io/opencensus/implcore/metrics/MetricRegistryImplTest.java
index 769efab2..ff3c96bc 100644
--- a/impl_core/src/test/java/io/opencensus/implcore/metrics/MetricRegistryImplTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/metrics/MetricRegistryImplTest.java
@@ -21,14 +21,14 @@ import static com.google.common.truth.Truth.assertThat;
 import io.opencensus.common.Timestamp;
 import io.opencensus.common.ToDoubleFunction;
 import io.opencensus.common.ToLongFunction;
-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 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.testing.common.TestClock;
 import java.util.Collections;
 import java.util.LinkedHashMap;
diff --git a/impl_core/src/test/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImplTest.java b/impl_core/src/test/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImplTest.java
index 7f2ec153..71790a3f 100644
--- a/impl_core/src/test/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImplTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/metrics/export/MetricProducerManagerImplTest.java
@@ -18,8 +18,8 @@ package io.opencensus.implcore.metrics.export;
 
 import static com.google.common.truth.Truth.assertThat;
 
-import io.opencensus.metrics.MetricProducer;
-import io.opencensus.metrics.export.MetricProducerManager;
+import io.opencensus.implcore.temporary.metrics.MetricProducer;
+import io.opencensus.implcore.temporary.metrics.export.MetricProducerManager;
 import java.util.Set;
 import org.junit.Before;
 import org.junit.Rule;
diff --git a/impl_core/src/test/java/io/opencensus/implcore/stats/MetricUtilsTest.java b/impl_core/src/test/java/io/opencensus/implcore/stats/MetricUtilsTest.java
index 7cc8d984..ad556fce 100644
--- a/impl_core/src/test/java/io/opencensus/implcore/stats/MetricUtilsTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/stats/MetricUtilsTest.java
@@ -20,10 +20,10 @@ import static com.google.common.truth.Truth.assertThat;
 
 import io.opencensus.common.Duration;
 import io.opencensus.common.Timestamp;
-import io.opencensus.metrics.LabelKey;
-import io.opencensus.metrics.LabelValue;
-import io.opencensus.metrics.MetricDescriptor;
-import io.opencensus.metrics.MetricDescriptor.Type;
+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.stats.Aggregation.Count;
 import io.opencensus.stats.Aggregation.Distribution;
 import io.opencensus.stats.Aggregation.LastValue;
diff --git a/impl_core/src/test/java/io/opencensus/implcore/stats/MutableAggregationTest.java b/impl_core/src/test/java/io/opencensus/implcore/stats/MutableAggregationTest.java
index ed85dded..94f27f89 100644
--- a/impl_core/src/test/java/io/opencensus/implcore/stats/MutableAggregationTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/stats/MutableAggregationTest.java
@@ -28,9 +28,9 @@ import io.opencensus.implcore.stats.MutableAggregation.MutableLastValueLong;
 import io.opencensus.implcore.stats.MutableAggregation.MutableMean;
 import io.opencensus.implcore.stats.MutableAggregation.MutableSumDouble;
 import io.opencensus.implcore.stats.MutableAggregation.MutableSumLong;
-import io.opencensus.metrics.Distribution.Bucket;
-import io.opencensus.metrics.Point;
-import io.opencensus.metrics.Value;
+import io.opencensus.implcore.temporary.metrics.Distribution.Bucket;
+import io.opencensus.implcore.temporary.metrics.Point;
+import io.opencensus.implcore.temporary.metrics.Value;
 import io.opencensus.stats.AggregationData;
 import io.opencensus.stats.AggregationData.CountData;
 import io.opencensus.stats.AggregationData.DistributionData;
@@ -300,7 +300,7 @@ public class MutableAggregationTest {
         .isEqualTo(
             Point.create(
                 Value.distributionValue(
-                    io.opencensus.metrics.Distribution.create(
+                    io.opencensus.implcore.temporary.metrics.Distribution.create(
                         0,
                         0,
                         0,
diff --git a/api/src/test/java/io/opencensus/metrics/DistributionTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/DistributionTest.java
index d511e317..eb867d07 100644
--- a/api/src/test/java/io/opencensus/metrics/DistributionTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/DistributionTest.java
@@ -14,14 +14,14 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.testing.EqualsTester;
 import io.opencensus.common.Timestamp;
-import io.opencensus.metrics.Distribution.Bucket;
-import io.opencensus.metrics.Distribution.Exemplar;
+import io.opencensus.implcore.temporary.metrics.Distribution.Bucket;
+import io.opencensus.implcore.temporary.metrics.Distribution.Exemplar;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
diff --git a/api/src/test/java/io/opencensus/metrics/LabelKeyTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/LabelKeyTest.java
index 83f2b59a..aabf868a 100644
--- a/api/src/test/java/io/opencensus/metrics/LabelKeyTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/LabelKeyTest.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
diff --git a/api/src/test/java/io/opencensus/metrics/LabelValueTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/LabelValueTest.java
index e5526b2f..92d6188b 100644
--- a/api/src/test/java/io/opencensus/metrics/LabelValueTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/LabelValueTest.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
diff --git a/api/src/test/java/io/opencensus/metrics/MetricDescriptorTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricDescriptorTest.java
index 9c0a42fc..fb02d22c 100644
--- a/api/src/test/java/io/opencensus/metrics/MetricDescriptorTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricDescriptorTest.java
@@ -14,12 +14,12 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.testing.EqualsTester;
-import io.opencensus.metrics.MetricDescriptor.Type;
+import io.opencensus.implcore.temporary.metrics.MetricDescriptor.Type;
 import java.util.Arrays;
 import java.util.List;
 import org.hamcrest.CoreMatchers;
diff --git a/api/src/test/java/io/opencensus/metrics/MetricRegistryTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricRegistryTest.java
index 49e8ce02..3bce8a84 100644
--- a/api/src/test/java/io/opencensus/metrics/MetricRegistryTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricRegistryTest.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import io.opencensus.common.ToDoubleFunction;
 import io.opencensus.common.ToLongFunction;
diff --git a/api/src/test/java/io/opencensus/metrics/MetricTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricTest.java
index 37deed4b..8ad03562 100644
--- a/api/src/test/java/io/opencensus/metrics/MetricTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricTest.java
@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.testing.EqualsTester;
 import io.opencensus.common.Timestamp;
-import io.opencensus.metrics.MetricDescriptor.Type;
+import io.opencensus.implcore.temporary.metrics.MetricDescriptor.Type;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
diff --git a/api/src/test/java/io/opencensus/metrics/MetricsComponentTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricsComponentTest.java
index 1c4e70f7..cc171637 100644
--- a/api/src/test/java/io/opencensus/metrics/MetricsComponentTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricsComponentTest.java
@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
-import io.opencensus.metrics.export.ExportComponent;
+import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;
diff --git a/api/src/test/java/io/opencensus/metrics/MetricsTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricsTest.java
index 9e0eee1f..f62934f8 100644
--- a/api/src/test/java/io/opencensus/metrics/MetricsTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/MetricsTest.java
@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
-import io.opencensus.metrics.export.ExportComponent;
+import io.opencensus.implcore.temporary.metrics.export.ExportComponent;
 import org.junit.Rule;
 import org.junit.Test;
 import org.junit.rules.ExpectedException;
@@ -54,7 +54,8 @@ public class MetricsTest {
           }
         };
     assertThat(Metrics.loadMetricsComponent(classLoader).getClass().getName())
-        .isEqualTo("io.opencensus.metrics.MetricsComponent$NoopMetricsComponent");
+        .isEqualTo(
+            "io.opencensus.implcore.temporary.metrics.MetricsComponent$NoopMetricsComponent");
   }
 
   @Test
diff --git a/api/src/test/java/io/opencensus/metrics/PointTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/PointTest.java
index cb6175c1..8caa21ed 100644
--- a/api/src/test/java/io/opencensus/metrics/PointTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/PointTest.java
@@ -14,13 +14,13 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.testing.EqualsTester;
 import io.opencensus.common.Timestamp;
-import io.opencensus.metrics.Distribution.Bucket;
+import io.opencensus.implcore.temporary.metrics.Distribution.Bucket;
 import java.util.Arrays;
 import org.junit.Test;
 import org.junit.runner.RunWith;
diff --git a/api/src/test/java/io/opencensus/metrics/TimeSeriesTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/TimeSeriesTest.java
index 07dff97d..c8cdac24 100644
--- a/api/src/test/java/io/opencensus/metrics/TimeSeriesTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/TimeSeriesTest.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
diff --git a/api/src/test/java/io/opencensus/metrics/ValueTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/ValueTest.java
index 63430b28..53b4c456 100644
--- a/api/src/test/java/io/opencensus/metrics/ValueTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/ValueTest.java
@@ -14,17 +14,17 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics;
+package io.opencensus.implcore.temporary.metrics;
 
 import static com.google.common.truth.Truth.assertThat;
 
 import com.google.common.testing.EqualsTester;
 import io.opencensus.common.Function;
 import io.opencensus.common.Functions;
-import io.opencensus.metrics.Distribution.Bucket;
-import io.opencensus.metrics.Value.ValueDistribution;
-import io.opencensus.metrics.Value.ValueDouble;
-import io.opencensus.metrics.Value.ValueLong;
+import io.opencensus.implcore.temporary.metrics.Distribution.Bucket;
+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 java.util.ArrayList;
 import java.util.Arrays;
 import java.util.List;
diff --git a/api/src/test/java/io/opencensus/metrics/export/ExportComponentTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/export/ExportComponentTest.java
index 15c6e883..7b5c91f2 100644
--- a/api/src/test/java/io/opencensus/metrics/export/ExportComponentTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/export/ExportComponentTest.java
@@ -14,7 +14,7 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics.export;
+package io.opencensus.implcore.temporary.metrics.export;
 
 import static com.google.common.truth.Truth.assertThat;
 
diff --git a/api/src/test/java/io/opencensus/metrics/export/MetricProducerManagerTest.java b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManagerTest.java
index 07854927..5044962b 100644
--- a/api/src/test/java/io/opencensus/metrics/export/MetricProducerManagerTest.java
+++ b/impl_core/src/test/java/io/opencensus/implcore/temporary/metrics/export/MetricProducerManagerTest.java
@@ -14,11 +14,11 @@
  * limitations under the License.
  */
 
-package io.opencensus.metrics.export;
+package io.opencensus.implcore.temporary.metrics.export;
 
 import static com.google.common.truth.Truth.assertThat;
 
-import io.opencensus.metrics.MetricProducer;
+import io.opencensus.implcore.temporary.metrics.MetricProducer;
 import org.junit.Before;
 import org.junit.Rule;
 import org.junit.Test;
diff --git a/impl_lite/src/main/java/io/opencensus/impllite/metrics/MetricsComponentImplLite.java b/impl_lite/src/main/java/io/opencensus/impllite/metrics/MetricsComponentImplLite.java
index 6161c12a..ccc9f345 100644
--- a/impl_lite/src/main/java/io/opencensus/impllite/metrics/MetricsComponentImplLite.java
+++ b/impl_lite/src/main/java/io/opencensus/impllite/metrics/MetricsComponentImplLite.java
@@ -18,7 +18,7 @@ package io.opencensus.impllite.metrics;
 
 import io.opencensus.implcore.common.MillisClock;
 import io.opencensus.implcore.metrics.MetricsComponentImplBase;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 
 /** Android-compatible implementation of {@link MetricsComponent}. */
 public final class MetricsComponentImplLite extends MetricsComponentImplBase {
diff --git a/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java b/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java
index 7ee900a6..388cac8f 100644
--- a/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java
+++ b/impl_lite/src/test/java/io/opencensus/impllite/metrics/MetricsTest.java
@@ -20,8 +20,8 @@ import static com.google.common.truth.Truth.assertThat;
 
 import io.opencensus.implcore.metrics.MetricRegistryImpl;
 import io.opencensus.implcore.metrics.export.ExportComponentImpl;
-import io.opencensus.metrics.Metrics;
-import io.opencensus.metrics.MetricsComponent;
+import io.opencensus.implcore.temporary.metrics.Metrics;
+import io.opencensus.implcore.temporary.metrics.MetricsComponent;
 import org.junit.Test;
 import org.junit.runner.RunWith;
 import org.junit.runners.JUnit4;