diff --git a/packages/opencensus-core/src/index.ts b/packages/opencensus-core/src/index.ts
index 63a8ec0f9..fd94b9b05 100644
--- a/packages/opencensus-core/src/index.ts
+++ b/packages/opencensus-core/src/index.ts
@@ -24,6 +24,29 @@ export * from './trace/instrumentation/types';
 export * from './trace/propagation/types';
 export * from './exporters/types';
 export * from './common/types';
+export * from './metrics/gauges/types';
+import {Metric, MetricDescriptor, TimeSeries, MetricDescriptorType, LabelKey, LabelValue, Point as TimeSeriesPoint, DistributionValue, BucketOptions, Bucket as DistributionBucket, SummaryValue, Explicit, Exemplar, Timestamp, Snapshot, ValueAtPercentile, MetricProducerManager, MetricProducer} from './metrics/export/types';
+
+export {
+  Metric,
+  MetricDescriptor,
+  TimeSeries,
+  MetricDescriptorType,
+  LabelKey,
+  LabelValue,
+  TimeSeriesPoint,
+  DistributionValue,
+  BucketOptions,
+  DistributionBucket,
+  SummaryValue,
+  Explicit,
+  Exemplar,
+  Timestamp,
+  Snapshot,
+  ValueAtPercentile,
+  MetricProducerManager,
+  MetricProducer
+};
 
 // classes
 
@@ -58,3 +81,12 @@ export {logger};
 
 // version
 export * from './common/version';
+
+// METRICS CLASSES
+
+export * from './metrics/metrics';
+export * from './metrics/metric-registry';
+
+// GAUGES CLASSES
+export * from './metrics/gauges/derived-gauge';
+export * from './metrics/gauges/gauge';
diff --git a/packages/opencensus-core/test/test-metric-component.ts b/packages/opencensus-core/test/test-metric-component.ts
index 4e47f5138..9f1792b21 100644
--- a/packages/opencensus-core/test/test-metric-component.ts
+++ b/packages/opencensus-core/test/test-metric-component.ts
@@ -20,7 +20,12 @@ import {MetricsComponent} from '../src/metrics/metric-component';
 import {MetricRegistry} from '../src/metrics/metric-registry';
 
 describe('MetricsComponent()', () => {
-  const metricsComponent: MetricsComponent = new MetricsComponent();
+  let metricsComponent: MetricsComponent;
+
+  beforeEach(() => {
+    metricProducerManagerInstance.removeAll();
+    metricsComponent = new MetricsComponent();
+  });
 
   it('should return a MetricRegistry instance', () => {
     assert.ok(metricsComponent.getMetricRegistry() instanceof MetricRegistry);