@@ -20,7 +20,6 @@
 import static com.google.cloud.bigtable.data.v2.stub.metrics.BuiltinMetricsConstants.CLIENT_NAME_KEY;
 import static com.google.cloud.bigtable.data.v2.stub.metrics.BuiltinMetricsConstants.INSTANCE_ID_KEY;
 
-import com.google.api.core.ApiFunction;
 import com.google.api.core.ApiFuture;
 import com.google.api.core.ApiFutures;
 import com.google.api.core.BetaApi;
@@ -138,7 +137,6 @@
 import com.google.common.collect.ImmutableMap;
 import com.google.common.util.concurrent.MoreExecutors;
 import com.google.protobuf.ByteString;
-import io.grpc.ManagedChannelBuilder;
 import io.grpc.MethodDescriptor;
 import io.opencensus.stats.Stats;
 import io.opencensus.stats.StatsRecorder;
@@ -158,8 +156,6 @@
 import java.util.Set;
 import java.util.concurrent.TimeUnit;
 import java.util.function.Function;
-import java.util.logging.Level;
-import java.util.logging.Logger;
 import javax.annotation.Nonnull;
 import javax.annotation.Nullable;