diff --git a/api/src/main/java/io/opentelemetry/metrics/DefaultMeter.java b/api/src/main/java/io/opentelemetry/metrics/DefaultMeter.java
index 6bfef5935af..70fc486e882 100644
--- a/api/src/main/java/io/opentelemetry/metrics/DefaultMeter.java
+++ b/api/src/main/java/io/opentelemetry/metrics/DefaultMeter.java
@@ -47,24 +47,6 @@ public static Meter getInstance() {
     return INSTANCE;
   }
 
-  @Override
-  public LongGauge.Builder longGaugeBuilder(String name) {
-    Utils.checkNotNull(name, "name");
-    Utils.checkArgument(
-        StringUtils.isPrintableString(name) && name.length() <= NAME_MAX_LENGTH,
-        ERROR_MESSAGE_INVALID_NAME);
-    return new NoopLongGauge.NoopBuilder();
-  }
-
-  @Override
-  public DoubleGauge.Builder doubleGaugeBuilder(String name) {
-    Utils.checkNotNull(name, "name");
-    Utils.checkArgument(
-        StringUtils.isPrintableString(name) && name.length() <= NAME_MAX_LENGTH,
-        ERROR_MESSAGE_INVALID_NAME);
-    return new NoopDoubleGauge.NoopBuilder();
-  }
-
   @Override
   public DoubleCounter.Builder doubleCounterBuilder(String name) {
     Utils.checkNotNull(name, "name");
@@ -143,96 +125,6 @@ public LabelSet createLabelSet(Map<String, String> labels) {
     return NoopLabelSet.INSTANCE;
   }
 
-  /** No-op implementation of LongGauge interface. */
-  @Immutable
-  private static final class NoopLongGauge implements LongGauge {
-
-    /** Creates a new {@code NoopBound}. */
-    private NoopLongGauge() {}
-
-    @Override
-    public void set(long val, LabelSet labelSet) {}
-
-    @Override
-    public NoopBoundLongGauge bind(LabelSet labelSet) {
-      Utils.checkNotNull(labelSet, "labelSet");
-      return NoopBoundLongGauge.INSTANCE;
-    }
-
-    @Override
-    public void unbind(BoundLongGauge boundInstrument) {
-      Utils.checkNotNull(boundInstrument, "boundLongGauge");
-    }
-
-    /** No-op implementation of BoundLongGauge interface. */
-    @Immutable
-    private enum NoopBoundLongGauge implements BoundLongGauge {
-      INSTANCE;
-
-      @Override
-      public void set(long val) {}
-    }
-
-    private static final class NoopBuilder extends NoopAbstractGaugeBuilder<Builder, LongGauge>
-        implements Builder {
-
-      @Override
-      protected Builder getThis() {
-        return this;
-      }
-
-      @Override
-      public LongGauge build() {
-        return new NoopLongGauge();
-      }
-    }
-  }
-
-  /** No-op implementation of DoubleGauge interface. */
-  @Immutable
-  private static final class NoopDoubleGauge implements DoubleGauge {
-
-    /** Creates a new {@code NoopBound}. */
-    private NoopDoubleGauge() {}
-
-    @Override
-    public void set(double val, LabelSet labelSet) {}
-
-    @Override
-    public NoopBoundDoubleGauge bind(LabelSet labelSet) {
-      Utils.checkNotNull(labelSet, "labelSet");
-      return NoopBoundDoubleGauge.INSTANCE;
-    }
-
-    @Override
-    public void unbind(BoundDoubleGauge boundInstrument) {
-      Utils.checkNotNull(boundInstrument, "boundDoubleGauge");
-    }
-
-    /** No-op implementation of BoundDoubleGauge interface. */
-    @Immutable
-    private enum NoopBoundDoubleGauge implements BoundDoubleGauge {
-      INSTANCE;
-
-      @Override
-      public void set(double val) {}
-    }
-
-    private static final class NoopBuilder extends NoopAbstractGaugeBuilder<Builder, DoubleGauge>
-        implements Builder {
-
-      @Override
-      protected Builder getThis() {
-        return this;
-      }
-
-      @Override
-      public DoubleGauge build() {
-        return new NoopDoubleGauge();
-      }
-    }
-  }
-
   /** No-op implementation of DoubleCounter interface. */
   @Immutable
   private static final class NoopDoubleCounter implements DoubleCounter {
@@ -500,15 +392,6 @@ public BatchRecorder put(DoubleMeasure measure, double value) {
     public void record() {}
   }
 
-  private abstract static class NoopAbstractGaugeBuilder<B extends Gauge.Builder<B, V>, V>
-      extends NoopAbstractInstrumentBuilder<B, V> implements Gauge.Builder<B, V> {
-
-    @Override
-    public B setMonotonic(boolean monotonic) {
-      return getThis();
-    }
-  }
-
   private abstract static class NoopAbstractCounterBuilder<B extends Counter.Builder<B, V>, V>
       extends NoopAbstractInstrumentBuilder<B, V> implements Counter.Builder<B, V> {
 
diff --git a/api/src/main/java/io/opentelemetry/metrics/DoubleGauge.java b/api/src/main/java/io/opentelemetry/metrics/DoubleGauge.java
deleted file mode 100644
index 2c04dcc5ad0..00000000000
--- a/api/src/main/java/io/opentelemetry/metrics/DoubleGauge.java
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.metrics;
-
-import io.opentelemetry.metrics.DoubleGauge.BoundDoubleGauge;
-import javax.annotation.concurrent.ThreadSafe;
-
-/**
- * Gauge metric, to report instantaneous measurement of a double value. Gauges can go both up and
- * down. The gauges values can be negative.
- *
- * <p>Example:
- *
- * <pre>{@code
- * class YourClass {
- *
- *   private static final Meter meter = OpenTelemetry.getMeterRegistry().get("my_library_name");
- *   private static final DoubleGauge gauge =
- *       meter
- *           .gaugeDoubleBuilder("processed_jobs")
- *           .setDescription("Processed jobs")
- *           .setUnit("1")
- *           .setLabelKeys(Collections.singletonList("Key"))
- *           .build();
- *   // It is recommended to keep a reference to a Bound Instrument.
- *   private static final BoundDoubleGauge someWorkBound =
- *       gauge.getBound(Collections.singletonList("SomeWork"));
- *
- *   void doSomeWork() {
- *      // Your code here.
- *      someWorkBound.set(15);
- *   }
- *
- * }
- * }</pre>
- *
- * @since 0.1.0
- */
-@ThreadSafe
-public interface DoubleGauge extends Gauge<BoundDoubleGauge> {
-
-  /**
-   * Sets the given value.
-   *
-   * <p>The value added is associated with the current {@code Context} and provided LabelSet.
-   *
-   * @param val the new value.
-   * @param labelSet the labels to be associated to this recording
-   * @since 0.1.0
-   */
-  void set(double val, LabelSet labelSet);
-
-  @Override
-  BoundDoubleGauge bind(LabelSet labelSet);
-
-  @Override
-  void unbind(BoundDoubleGauge boundInstrument);
-
-  /**
-   * A {@code Bound Instrument} for a {@code DoubleGauge}.
-   *
-   * @since 0.1.0
-   */
-  @ThreadSafe
-  interface BoundDoubleGauge {
-
-    /**
-     * Sets the given value.
-     *
-     * <p>The value added is associated with the current {@code Context}.
-     *
-     * @param val the new value.
-     * @since 0.1.0
-     */
-    void set(double val);
-  }
-
-  /** Builder class for {@link LongGauge}. */
-  interface Builder extends Gauge.Builder<Builder, DoubleGauge> {}
-}
diff --git a/api/src/main/java/io/opentelemetry/metrics/Gauge.java b/api/src/main/java/io/opentelemetry/metrics/Gauge.java
deleted file mode 100644
index 70363e25ea8..00000000000
--- a/api/src/main/java/io/opentelemetry/metrics/Gauge.java
+++ /dev/null
@@ -1,39 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.metrics;
-
-/**
- * Base interface for all the Gauge metrics.
- *
- * @param <H> the specific Bound Gauge type.
- * @since 0.1.0
- */
-public interface Gauge<H> extends InstrumentWithBinding<H> {
-  /** Builder class for {@link Gauge}. */
-  interface Builder<B extends Gauge.Builder<B, V>, V> extends Instrument.Builder<B, V> {
-    /**
-     * Sets the monotonicity property for this {@code Instrument}. If {@code true} successive values
-     * are expected to rise monotonically.
-     *
-     * <p>Default value is {@code false}
-     *
-     * @param monotonic {@code true} successive values are expected to rise monotonically.
-     * @return this.
-     */
-    B setMonotonic(boolean monotonic);
-  }
-}
diff --git a/api/src/main/java/io/opentelemetry/metrics/LongGauge.java b/api/src/main/java/io/opentelemetry/metrics/LongGauge.java
deleted file mode 100644
index 76b35840c46..00000000000
--- a/api/src/main/java/io/opentelemetry/metrics/LongGauge.java
+++ /dev/null
@@ -1,94 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.metrics;
-
-import io.opentelemetry.metrics.LongGauge.BoundLongGauge;
-import javax.annotation.concurrent.ThreadSafe;
-
-/**
- * Gauge metric, to report instantaneous measurement of an long value. Gauges can go both up and
- * down. The gauges values can be negative.
- *
- * <p>Example:
- *
- * <pre>{@code
- * class YourClass {
- *
- *   private static final Meter meter = OpenTelemetry.getMeterRegistry().get("my_library_name");
- *   private static final LongGauge gauge =
- *       meter
- *           .gaugeLongBuilder("processed_jobs")
- *           .setDescription("Processed jobs")
- *           .setUnit("1")
- *           .setLabelKeys(Collections.singletonList("Key"))
- *           .build();
- *   // It is recommended to keep a reference to a Bound Instrument.
- *   private static final BoundLongGauge someWorkBound =
- *       gauge.getBound(Collections.singletonList("SomeWork"));
- *
- *   void doSomeWork() {
- *      // Your code here.
- *      someWorkBound.set(15);
- *   }
- *
- * }
- * }</pre>
- *
- * @since 0.1.0
- */
-@ThreadSafe
-public interface LongGauge extends Gauge<BoundLongGauge> {
-
-  /**
-   * Sets the given value for the gauge.
-   *
-   * <p>The value added is associated with the current {@code Context} and provided LabelSet.
-   *
-   * @param val the new value.
-   * @param labelSet the labels to be associated to this value
-   * @since 0.1.0
-   */
-  void set(long val, LabelSet labelSet);
-
-  @Override
-  BoundLongGauge bind(LabelSet labelSet);
-
-  @Override
-  void unbind(BoundLongGauge boundInstrument);
-
-  /**
-   * A {@code Bound Instrument} for a {@code LongGauge}.
-   *
-   * @since 0.1.0
-   */
-  @ThreadSafe
-  interface BoundLongGauge {
-
-    /**
-     * Sets the given value for the gauge.
-     *
-     * <p>The value added is associated with the current {@code Context}.
-     *
-     * @param val the new value.
-     * @since 0.1.0
-     */
-    void set(long val);
-  }
-
-  /** Builder class for {@link LongGauge}. */
-  interface Builder extends Gauge.Builder<Builder, LongGauge> {}
-}
diff --git a/api/src/main/java/io/opentelemetry/metrics/Meter.java b/api/src/main/java/io/opentelemetry/metrics/Meter.java
index 40c6b8efda4..ae10ceebddb 100644
--- a/api/src/main/java/io/opentelemetry/metrics/Meter.java
+++ b/api/src/main/java/io/opentelemetry/metrics/Meter.java
@@ -32,114 +32,11 @@
  *       report cpu/memory usage, or simple metrics like "queue_length".
  * </ul>
  *
- * <p>Example usage for raw measurement:
- *
- * <pre>{@code
- * class MyClass {
- *   private static final Meter meter = Metrics.getMeterRegistry().get("my_library_name");
- *   private static final DoubleMeasure cacheHit = meter.measureDoubleBuilder("cache_hit").build();
- *
- *   Response serverBoundr(Request request) {
- *     if (inCache(request)) {
- *       cacheHit.record(1);
- *       return fromCache(request);
- *     }
- *     ...  // do other work
- *   }
- *
- * }
- * }</pre>
- *
- * <p>Example usage for already aggregated metrics:
- *
- * <pre>{@code
- * class YourClass {
- *   private static final Meter meter = Metrics.getMeterRegistry().get("my_library_name");
- *   private static final CounterLong collectionMetric =
- *       meter
- *           .counterLongBuilder("collection")
- *           .setDescription("Time spent in a given JVM garbage collector in milliseconds.")
- *           .setUnit("ms")
- *           .setLabelKeys(Collections.singletonList(GC))
- *           .build();
- *
- *   public final void exportGarbageCollectorMetrics {
- *     collectionMetric.setCallback(
- *         new Runnable() {
- *          {@literal @}Override
- *           public void run() {
- *             for (GarbageCollectorMXBean gc : ManagementFactory.getGarbageCollectorMXBeans()) {
- *               LabelValue gcName = LabelValue.create(gc.getName());
- *               collectionMetric
- *                   .getBound(Collections.singletonList(gcName))
- *                   .set(gc.getCollectionTime());
- *             }
- *           }
- *         });
- *   }
- * }
- * }</pre>
- *
- * <p>Example usage for simple pre-defined aggregation metrics:
- *
- * <pre>{@code
- * class YourClass {
- *   private static final Meter meter = Metrics.getMeterRegistry().get("my_library_name");
- *   private static final List<String> keys = Collections.singletonList("Name");
- *   private static final List<String> values = Collections.singletonList("Inbound");
- *   private static final DoubleGauge gauge =
- *       meter
- *           .longGaugeBuilder("queue_size")
- *           .setDescription("Pending jobs")
- *           .setUnit("1")
- *           .setLabelKeys(labelKeys)
- *           .build();
- *
- *   // It is recommended that API users keep a reference to a Bound Instrument.
- *   DoubleGauge.BoundDoubleGauge inboundBoundGauge = gauge.bind(labelValues);
- *
- *   void doAddElement() {
- *      // Your code here.
- *      inboundBoundGauge.set(1);
- *   }
- *
- *   void doRemoveElement() {
- *      inboundBoundGauge.set(-1);
- *      // Your code here.
- *   }
- *
- * }
- * }</pre>
+ * <p>TODO: Update comment.
  */
 @ThreadSafe
 public interface Meter {
 
-  /**
-   * Returns a builder for a {@link LongGauge}.
-   *
-   * @param name the name of the metric. Should be a ASCII string with a length no greater than 255
-   *     characters.
-   * @return a {@code LongGauge.Builder}.
-   * @throws NullPointerException if {@code name} is null.
-   * @throws IllegalArgumentException if different metric with the same name already registered.
-   * @throws IllegalArgumentException if the {@code name} does not match the requirements.
-   * @since 0.1.0
-   */
-  LongGauge.Builder longGaugeBuilder(String name);
-
-  /**
-   * Returns a builder for a {@link DoubleGauge}.
-   *
-   * @param name the name of the metric. Should be a ASCII string with a length no greater than 255
-   *     characters.
-   * @return a {@code DoubleGauge.Builder}.
-   * @throws NullPointerException if {@code name} is null.
-   * @throws IllegalArgumentException if different metric with the same name already registered.
-   * @throws IllegalArgumentException if the {@code name} does not match the requirements.
-   * @since 0.1.0
-   */
-  DoubleGauge.Builder doubleGaugeBuilder(String name);
-
   /**
    * Returns a builder for a {@link DoubleCounter}.
    *
diff --git a/api/src/test/java/io/opentelemetry/OpenTelemetryTest.java b/api/src/test/java/io/opentelemetry/OpenTelemetryTest.java
index 1f0b0d3609c..546aad3a9b2 100644
--- a/api/src/test/java/io/opentelemetry/OpenTelemetryTest.java
+++ b/api/src/test/java/io/opentelemetry/OpenTelemetryTest.java
@@ -29,12 +29,10 @@
 import io.opentelemetry.metrics.BatchRecorder;
 import io.opentelemetry.metrics.DefaultMeterRegistry;
 import io.opentelemetry.metrics.DoubleCounter;
-import io.opentelemetry.metrics.DoubleGauge;
 import io.opentelemetry.metrics.DoubleMeasure;
 import io.opentelemetry.metrics.DoubleObserver;
 import io.opentelemetry.metrics.LabelSet;
 import io.opentelemetry.metrics.LongCounter;
-import io.opentelemetry.metrics.LongGauge;
 import io.opentelemetry.metrics.LongMeasure;
 import io.opentelemetry.metrics.LongObserver;
 import io.opentelemetry.metrics.Meter;
@@ -311,18 +309,6 @@ public MeterRegistry create() {
       return new FirstMetricsProvider();
     }
 
-    @Nullable
-    @Override
-    public LongGauge.Builder longGaugeBuilder(String name) {
-      return null;
-    }
-
-    @Nullable
-    @Override
-    public DoubleGauge.Builder doubleGaugeBuilder(String name) {
-      return null;
-    }
-
     @Nullable
     @Override
     public DoubleCounter.Builder doubleCounterBuilder(String name) {
diff --git a/api/src/test/java/io/opentelemetry/metrics/DefaultMeterTest.java b/api/src/test/java/io/opentelemetry/metrics/DefaultMeterTest.java
index 89ef658b77e..b3c716f1a58 100644
--- a/api/src/test/java/io/opentelemetry/metrics/DefaultMeterTest.java
+++ b/api/src/test/java/io/opentelemetry/metrics/DefaultMeterTest.java
@@ -28,20 +28,6 @@ public final class DefaultMeterTest {
   private static final Meter defaultMeter = DefaultMeter.getInstance();
   @Rule public final ExpectedException thrown = ExpectedException.none();
 
-  @Test
-  public void noopAddLongGauge_NullName() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("name");
-    defaultMeter.longGaugeBuilder(null);
-  }
-
-  @Test
-  public void noopAddDoubleGauge_NullName() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("name");
-    defaultMeter.doubleGaugeBuilder(null);
-  }
-
   @Test
   public void noopAddDoubleCumulative_NullName() {
     thrown.expect(NullPointerException.class);
diff --git a/api/src/test/java/io/opentelemetry/metrics/DoubleGaugeTest.java b/api/src/test/java/io/opentelemetry/metrics/DoubleGaugeTest.java
deleted file mode 100644
index 3e2b3653950..00000000000
--- a/api/src/test/java/io/opentelemetry/metrics/DoubleGaugeTest.java
+++ /dev/null
@@ -1,134 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.metrics;
-
-import io.opentelemetry.OpenTelemetry;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.ExpectedException;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
-
-/** Unit tests for {@link DoubleGauge}. */
-@RunWith(JUnit4.class)
-public class DoubleGaugeTest {
-  @Rule public ExpectedException thrown = ExpectedException.none();
-
-  private static final String NAME = "name";
-  private static final String DESCRIPTION = "description";
-  private static final String UNIT = "1";
-  private static final List<String> LABEL_KEY = Collections.singletonList("key");
-
-  private final Meter meter = OpenTelemetry.getMeterRegistry().get("gauge_double_test");
-
-  @Test
-  public void preventNonPrintableName() {
-    thrown.expect(IllegalArgumentException.class);
-    meter.doubleGaugeBuilder("\2").build();
-  }
-
-  @Test
-  public void preventTooLongName() {
-    char[] chars = new char[DefaultMeter.NAME_MAX_LENGTH + 1];
-    Arrays.fill(chars, 'a');
-    String longName = String.valueOf(chars);
-    thrown.expect(IllegalArgumentException.class);
-    thrown.expectMessage(DefaultMeter.ERROR_MESSAGE_INVALID_NAME);
-    meter.doubleGaugeBuilder(longName).build();
-  }
-
-  @Test
-  public void preventNull_Description() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("description");
-    meter.doubleGaugeBuilder("metric").setDescription(null).build();
-  }
-
-  @Test
-  public void preventNull_Unit() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("unit");
-    meter.doubleGaugeBuilder("metric").setUnit(null).build();
-  }
-
-  @Test
-  public void preventNull_LabelKeys() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("labelKeys");
-    meter.doubleGaugeBuilder("metric").setLabelKeys(null).build();
-  }
-
-  @Test
-  public void preventNull_LabelKey() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("labelKey");
-    meter
-        .doubleGaugeBuilder("metric")
-        .setLabelKeys(Collections.<String>singletonList(null))
-        .build();
-  }
-
-  @Test
-  public void preventNull_ConstantLabels() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("constantLabels");
-    meter.doubleGaugeBuilder("metric").setConstantLabels(null).build();
-  }
-
-  @Test
-  public void noopBind_WithNullLabelSet() {
-    DoubleGauge doubleGauge =
-        meter
-            .doubleGaugeBuilder(NAME)
-            .setDescription(DESCRIPTION)
-            .setLabelKeys(LABEL_KEY)
-            .setUnit(UNIT)
-            .build();
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("labelSet");
-    doubleGauge.bind(null);
-  }
-
-  @Test
-  public void noopUnbind_WithNullInstrument() {
-    DoubleGauge doubleGauge =
-        meter
-            .doubleGaugeBuilder(NAME)
-            .setDescription(DESCRIPTION)
-            .setLabelKeys(LABEL_KEY)
-            .setUnit(UNIT)
-            .build();
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("boundDoubleGauge");
-    doubleGauge.unbind(null);
-  }
-
-  @Test
-  public void doesNotThrow() {
-    DoubleGauge doubleGauge =
-        meter
-            .doubleGaugeBuilder(NAME)
-            .setDescription(DESCRIPTION)
-            .setLabelKeys(LABEL_KEY)
-            .setUnit(UNIT)
-            .build();
-    doubleGauge.bind(meter.createLabelSet()).set(5.0);
-  }
-}
diff --git a/api/src/test/java/io/opentelemetry/metrics/LongGaugeTest.java b/api/src/test/java/io/opentelemetry/metrics/LongGaugeTest.java
deleted file mode 100644
index fc446e3806d..00000000000
--- a/api/src/test/java/io/opentelemetry/metrics/LongGaugeTest.java
+++ /dev/null
@@ -1,131 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.metrics;
-
-import io.opentelemetry.OpenTelemetry;
-import java.util.Arrays;
-import java.util.Collections;
-import java.util.List;
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.ExpectedException;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
-
-/** Unit tests for {@link LongGauge}. */
-@RunWith(JUnit4.class)
-public class LongGaugeTest {
-  @Rule public ExpectedException thrown = ExpectedException.none();
-
-  private static final String NAME = "name";
-  private static final String DESCRIPTION = "description";
-  private static final String UNIT = "1";
-  private static final List<String> LABEL_KEY = Collections.singletonList("key");
-
-  private final Meter meter = OpenTelemetry.getMeterRegistry().get("gauge_long_test");
-
-  @Test
-  public void preventNonPrintableName() {
-    thrown.expect(IllegalArgumentException.class);
-    meter.longGaugeBuilder("\2").build();
-  }
-
-  @Test
-  public void preventTooLongName() {
-    char[] chars = new char[DefaultMeter.NAME_MAX_LENGTH + 1];
-    Arrays.fill(chars, 'a');
-    String longName = String.valueOf(chars);
-    thrown.expect(IllegalArgumentException.class);
-    thrown.expectMessage(DefaultMeter.ERROR_MESSAGE_INVALID_NAME);
-    meter.longGaugeBuilder(longName).build();
-  }
-
-  @Test
-  public void preventNull_Description() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("description");
-    meter.longGaugeBuilder("metric").setDescription(null).build();
-  }
-
-  @Test
-  public void preventNull_Unit() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("unit");
-    meter.longGaugeBuilder("metric").setUnit(null).build();
-  }
-
-  @Test
-  public void preventNull_LabelKeys() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("labelKeys");
-    meter.longGaugeBuilder("metric").setLabelKeys(null).build();
-  }
-
-  @Test
-  public void preventNull_LabelKey() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("labelKey");
-    meter.longGaugeBuilder("metric").setLabelKeys(Collections.<String>singletonList(null)).build();
-  }
-
-  @Test
-  public void preventNull_ConstantLabels() {
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("constantLabels");
-    meter.longGaugeBuilder("metric").setConstantLabels(null).build();
-  }
-
-  @Test
-  public void noopBind_WithNullLabelSet() {
-    LongGauge longGauge =
-        meter
-            .longGaugeBuilder(NAME)
-            .setDescription(DESCRIPTION)
-            .setLabelKeys(LABEL_KEY)
-            .setUnit(UNIT)
-            .build();
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("labelSet");
-    longGauge.bind(null);
-  }
-
-  @Test
-  public void noopUnbind_WithNullBound() {
-    LongGauge longGauge =
-        meter
-            .longGaugeBuilder(NAME)
-            .setDescription(DESCRIPTION)
-            .setLabelKeys(LABEL_KEY)
-            .setUnit(UNIT)
-            .build();
-    thrown.expect(NullPointerException.class);
-    thrown.expectMessage("boundLongGauge");
-    longGauge.unbind(null);
-  }
-
-  @Test
-  public void doesNotThrow() {
-    LongGauge longGauge =
-        meter
-            .longGaugeBuilder(NAME)
-            .setDescription(DESCRIPTION)
-            .setLabelKeys(LABEL_KEY)
-            .setUnit(UNIT)
-            .build();
-    longGauge.bind(meter.createLabelSet()).set(5);
-  }
-}
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/AbstractGaugeBuilder.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/AbstractGaugeBuilder.java
deleted file mode 100644
index 8fc9f7af87a..00000000000
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/AbstractGaugeBuilder.java
+++ /dev/null
@@ -1,38 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.sdk.metrics;
-
-import io.opentelemetry.metrics.Gauge;
-
-abstract class AbstractGaugeBuilder<B extends Gauge.Builder<B, V>, V>
-    extends AbstractInstrumentBuilder<B, V> implements Gauge.Builder<B, V> {
-  private boolean monotonic = false;
-
-  protected AbstractGaugeBuilder(String name) {
-    super(name);
-  }
-
-  @Override
-  public final B setMonotonic(boolean monotonic) {
-    this.monotonic = monotonic;
-    return getThis();
-  }
-
-  final boolean isMonotonic() {
-    return this.monotonic;
-  }
-}
diff --git a/sdk/src/main/java/io/opentelemetry/sdk/metrics/MeterSdk.java b/sdk/src/main/java/io/opentelemetry/sdk/metrics/MeterSdk.java
index ba93e4d68f3..1b29bbb7fa2 100644
--- a/sdk/src/main/java/io/opentelemetry/sdk/metrics/MeterSdk.java
+++ b/sdk/src/main/java/io/opentelemetry/sdk/metrics/MeterSdk.java
@@ -18,12 +18,10 @@
 
 import io.opentelemetry.metrics.BatchRecorder;
 import io.opentelemetry.metrics.DoubleCounter;
-import io.opentelemetry.metrics.DoubleGauge;
 import io.opentelemetry.metrics.DoubleMeasure;
 import io.opentelemetry.metrics.DoubleObserver;
 import io.opentelemetry.metrics.LabelSet;
 import io.opentelemetry.metrics.LongCounter;
-import io.opentelemetry.metrics.LongGauge;
 import io.opentelemetry.metrics.LongMeasure;
 import io.opentelemetry.metrics.LongObserver;
 import io.opentelemetry.metrics.Meter;
@@ -48,16 +46,6 @@ MeterSharedState getSharedState() {
     return sharedState;
   }
 
-  @Override
-  public LongGauge.Builder longGaugeBuilder(String name) {
-    throw new UnsupportedOperationException("to be implemented");
-  }
-
-  @Override
-  public DoubleGauge.Builder doubleGaugeBuilder(String name) {
-    throw new UnsupportedOperationException("to be implemented");
-  }
-
   @Override
   public DoubleCounter.Builder doubleCounterBuilder(String name) {
     return DoubleCounterSdk.builder(name);
diff --git a/sdk/src/test/java/io/opentelemetry/sdk/metrics/AbstractGaugeBuilderTest.java b/sdk/src/test/java/io/opentelemetry/sdk/metrics/AbstractGaugeBuilderTest.java
deleted file mode 100644
index 64e95493707..00000000000
--- a/sdk/src/test/java/io/opentelemetry/sdk/metrics/AbstractGaugeBuilderTest.java
+++ /dev/null
@@ -1,91 +0,0 @@
-/*
- * Copyright 2019, OpenTelemetry 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.opentelemetry.sdk.metrics;
-
-import static com.google.common.truth.Truth.assertThat;
-
-import io.opentelemetry.metrics.Gauge;
-import io.opentelemetry.metrics.LabelSet;
-import org.junit.Rule;
-import org.junit.Test;
-import org.junit.rules.ExpectedException;
-import org.junit.runner.RunWith;
-import org.junit.runners.JUnit4;
-
-/** Unit tests for {@link AbstractGaugeBuilder}. */
-@RunWith(JUnit4.class)
-public class AbstractGaugeBuilderTest {
-  @Rule public ExpectedException thrown = ExpectedException.none();
-
-  private static final String NAME = "name";
-
-  @Test
-  public void defaultValue() {
-    TestInstrumentBuilder testMetricBuilder = TestInstrumentBuilder.newBuilder(NAME);
-    assertThat(testMetricBuilder.getName()).isEqualTo(NAME);
-    assertThat(testMetricBuilder.getDescription()).isEmpty();
-    assertThat(testMetricBuilder.getUnit()).isEqualTo("1");
-    assertThat(testMetricBuilder.getLabelKeys()).isEmpty();
-    assertThat(testMetricBuilder.getConstantLabels()).isEmpty();
-    assertThat(testMetricBuilder.isMonotonic()).isFalse();
-    assertThat(testMetricBuilder.build()).isInstanceOf(TestInstrument.class);
-  }
-
-  @Test
-  public void setAndGetValues() {
-    TestInstrumentBuilder testMetricBuilder =
-        TestInstrumentBuilder.newBuilder(NAME).setMonotonic(true);
-    assertThat(testMetricBuilder.getName()).isEqualTo(NAME);
-    assertThat(testMetricBuilder.isMonotonic()).isTrue();
-    assertThat(testMetricBuilder.build()).isInstanceOf(TestInstrument.class);
-  }
-
-  private static final class TestInstrumentBuilder
-      extends AbstractGaugeBuilder<TestInstrumentBuilder, TestInstrument> {
-    static TestInstrumentBuilder newBuilder(String name) {
-      return new TestInstrumentBuilder(name);
-    }
-
-    TestInstrumentBuilder(String name) {
-      super(name);
-    }
-
-    @Override
-    TestInstrumentBuilder getThis() {
-      return this;
-    }
-
-    @Override
-    public TestInstrument build() {
-      return new TestInstrument();
-    }
-  }
-
-  private static final class TestInstrument implements Gauge<TestBound> {
-    private static final TestBound HANDLE = new TestBound();
-
-    @Override
-    public TestBound bind(LabelSet labelSet) {
-      return HANDLE;
-    }
-
-    @Override
-    public void unbind(TestBound boundInstrument) {}
-  }
-
-  private static final class TestBound {}
-}