diff --git a/.circleci/config.yml b/.circleci/config.yml
index 4134298bfa6..a52d62cdba1 100644
--- a/.circleci/config.yml
+++ b/.circleci/config.yml
@@ -13,6 +13,40 @@ postgres_service: &postgres_service
     POSTGRES_USER: postgres
     POSTGRES_DB: circle_database
 
+cache_1: &cache_1
+  key: npm-cache-01-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/checksums.txt" }}-1
+  paths:
+    - ./node_modules
+    - ./yarn.lock
+    - packages/opentelemetry-base/node_modules
+    - packages/opentelemetry-scope-base/node_modules
+    - packages/opentelemetry-types/node_modules
+    - packages/opentelemetry-scope-async-hooks/node_modules
+    - packages/opentelemetry-core/node_modules
+    - packages/opentelemetry-exporter-prometheus/node_modules
+    - packages/opentelemetry-metrics/node_modules
+    - packages/opentelemetry-tracing/node_modules
+    - packages/opentelemetry-exporter-jaeger/node_modules
+    - packages/opentelemetry-exporter-zipkin/node_modules
+    - packages/opentelemetry-node/node_modules
+    - packages/opentelemetry-shim-opentracing/node_modules
+    - packages/opentelemetry-web/node_modules
+    - packages/opentelemetry-plugin-dns/node_modules
+
+cache_2: &cache_2
+  key: npm-cache-02-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/checksums.txt" }}-2
+  paths:
+    - packages/opentelemetry-plugin-grpc/node_modules
+    - packages/opentelemetry-plugin-http/node_modules
+    - packages/opentelemetry-plugin-http2/node_modules
+    - packages/opentelemetry-plugin-mongodb/node_modules
+    - packages/opentelemetry-plugin-redis/node_modules
+    - packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg/node_modules
+    - packages/opentelemetry-plugin-document-load/node_modules
+    - packages/opentelemetry-plugin-https/node_modules
+    - packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg-pool/node_modules
+    - packages/opentelemetry-exporter-prometheus/node_modules
+
 node_unit_tests: &node_unit_tests
   steps:
     - checkout
@@ -31,17 +65,17 @@ node_unit_tests: &node_unit_tests
           echo "CIRCLE_NODE_VERSION=${CIRCLE_NODE_VERSION}"
     - restore_cache:
         keys:
-          - npm-cache-{{ checksum "/tmp/checksums.txt" }}
+          - npm-cache-01-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/checksums.txt" }}-1
+    - restore_cache:
+        keys:
+          - npm-cache-02-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/checksums.txt" }}-2
     - run:
         name: Install Dependencies
         command: yarn install
     - save_cache:
-        key: npm-cache-{{ checksum "/tmp/checksums.txt" }}
-        paths:
-          - ./node_modules
-          - ./yarn.lock
-          - ./packages/*/node_modules
-          - ./packages/*/yarn.lock
+        <<: *cache_1
+    - save_cache:
+        <<: *cache_2
     - run:
         name: Compile code
         command: yarn compile
@@ -55,6 +89,9 @@ node_unit_tests: &node_unit_tests
 browsers_unit_tests: &browsers_unit_tests
   steps:
     - checkout
+    - run:
+        name: Create Checksum
+        command: sh .circleci/checksum.sh /tmp/checksums.txt
     - run:
         name: Setup environment variables
         command: |
@@ -65,9 +102,19 @@ browsers_unit_tests: &browsers_unit_tests
         command: |
           node --version
           echo "CIRCLE_NODE_VERSION=${CIRCLE_NODE_VERSION}"
+    - restore_cache:
+        keys:
+          - npm-cache-01-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/checksums.txt" }}-1
+    - restore_cache:
+        keys:
+          - npm-cache-02-{{ .Environment.CIRCLE_JOB }}-{{ checksum "/tmp/checksums.txt" }}-1
     - run:
         name: Install Dependencies
         command: yarn install
+    - save_cache:
+        <<: *cache_1
+    - save_cache:
+        <<: *cache_2
     - run:
         name: Compile code
         command: yarn compile
diff --git a/package.json b/package.json
index fa81f068915..120e8a4688a 100644
--- a/package.json
+++ b/package.json
@@ -38,7 +38,7 @@
     "@commitlint/config-conventional": "^8.2.0",
     "beautify-benchmark": "^0.2.4",
     "benchmark": "^2.1.4",
-    "gts": "^1.0.0",
+    "gts": "^1.1.0",
     "husky": "^3.0.9",
     "lerna": "^3.17.0",
     "lerna-changelog": "^0.8.2",
diff --git a/packages/opentelemetry-base/package.json b/packages/opentelemetry-base/package.json
index 42cf058b579..9ec79269e94 100644
--- a/packages/opentelemetry-base/package.json
+++ b/packages/opentelemetry-base/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opentelemetry/base",
   "version": "0.2.0",
-  "description": "OpenTelemetry base",
+  "description": "OpenTelemetry base provides base code for the SDK packages",
   "main": "build/src/index.js",
   "types": "build/src/index.d.ts",
   "repository": "open-telemetry/opentelemetry-js",
@@ -43,8 +43,8 @@
   "devDependencies": {
     "@types/mocha": "^5.2.5",
     "@types/node": "^12.6.8",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "mocha": "^6.1.0",
     "nyc": "^14.1.1",
     "rimraf": "^3.0.0",
diff --git a/packages/opentelemetry-core/package.json b/packages/opentelemetry-core/package.json
index 11a6a47364f..8b56e65d9c3 100644
--- a/packages/opentelemetry-core/package.json
+++ b/packages/opentelemetry-core/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@opentelemetry/core",
   "version": "0.2.0",
-  "description": "OpenTelemetry Core",
+  "description": "OpenTelemetry Core provides default and no-op implementations of the OpenTelemetry types for trace and metrics",
   "main": "build/src/index.js",
   "browser": {
     "./src/platform/index.ts": "./src/platform/browser/index.ts",
@@ -54,8 +54,8 @@
     "@types/semver": "^6.2.0",
     "@types/sinon": "^7.0.13",
     "@types/webpack-env": "1.13.9",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "istanbul-instrumenter-loader": "^3.0.1",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",
diff --git a/packages/opentelemetry-core/src/metrics/NoopMeter.ts b/packages/opentelemetry-core/src/metrics/NoopMeter.ts
index 9f354cbaa07..6f2cb99507e 100644
--- a/packages/opentelemetry-core/src/metrics/NoopMeter.ts
+++ b/packages/opentelemetry-core/src/metrics/NoopMeter.ts
@@ -21,6 +21,7 @@ import {
   Meter,
   Metric,
   MetricOptions,
+  MetricUtils,
   MeasureHandle,
   SpanContext,
   LabelSet,
@@ -110,6 +111,38 @@ export class NoopMetric<T> implements Metric<T> {
   }
 }
 
+export class NoopCounterMetric extends NoopMetric<CounterHandle>
+  implements Pick<MetricUtils, 'add'> {
+  add(value: number, labelSet: LabelSet) {
+    this.getHandle(labelSet).add(value);
+  }
+}
+
+export class NoopGaugeMetric extends NoopMetric<GaugeHandle>
+  implements Pick<MetricUtils, 'set'> {
+  set(value: number, labelSet: LabelSet) {
+    this.getHandle(labelSet).set(value);
+  }
+}
+
+export class NoopMeasureMetric extends NoopMetric<MeasureHandle>
+  implements Pick<MetricUtils, 'record'> {
+  record(
+    value: number,
+    labelSet: LabelSet,
+    distContext?: DistributedContext,
+    spanContext?: SpanContext
+  ) {
+    if (typeof distContext === 'undefined') {
+      this.getHandle(labelSet).record(value);
+    } else if (typeof spanContext === 'undefined') {
+      this.getHandle(labelSet).record(value, distContext);
+    } else {
+      this.getHandle(labelSet).record(value, distContext, spanContext);
+    }
+  }
+}
+
 export class NoopCounterHandle implements CounterHandle {
   add(value: number): void {
     return;
@@ -133,16 +166,12 @@ export class NoopMeasureHandle implements MeasureHandle {
 }
 
 export const NOOP_GAUGE_HANDLE = new NoopGaugeHandle();
-export const NOOP_GAUGE_METRIC = new NoopMetric<GaugeHandle>(NOOP_GAUGE_HANDLE);
+export const NOOP_GAUGE_METRIC = new NoopGaugeMetric(NOOP_GAUGE_HANDLE);
 
 export const NOOP_COUNTER_HANDLE = new NoopCounterHandle();
-export const NOOP_COUNTER_METRIC = new NoopMetric<CounterHandle>(
-  NOOP_COUNTER_HANDLE
-);
+export const NOOP_COUNTER_METRIC = new NoopCounterMetric(NOOP_COUNTER_HANDLE);
 
 export const NOOP_MEASURE_HANDLE = new NoopMeasureHandle();
-export const NOOP_MEASURE_METRIC = new NoopMetric<MeasureHandle>(
-  NOOP_MEASURE_HANDLE
-);
+export const NOOP_MEASURE_METRIC = new NoopMeasureMetric(NOOP_MEASURE_HANDLE);
 
 export const NOOP_LABEL_SET = {} as LabelSet;
diff --git a/packages/opentelemetry-exporter-jaeger/package.json b/packages/opentelemetry-exporter-jaeger/package.json
index 798368b9e41..0fe7d1f8c6f 100644
--- a/packages/opentelemetry-exporter-jaeger/package.json
+++ b/packages/opentelemetry-exporter-jaeger/package.json
@@ -40,7 +40,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-exporter-prometheus/package.json b/packages/opentelemetry-exporter-prometheus/package.json
index 4361f1bf519..ac3c74ae1a5 100644
--- a/packages/opentelemetry-exporter-prometheus/package.json
+++ b/packages/opentelemetry-exporter-prometheus/package.json
@@ -40,7 +40,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.2",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-exporter-zipkin/package.json b/packages/opentelemetry-exporter-zipkin/package.json
index 0e6c7f5c55c..8a79cf9dfec 100644
--- a/packages/opentelemetry-exporter-zipkin/package.json
+++ b/packages/opentelemetry-exporter-zipkin/package.json
@@ -41,7 +41,7 @@
     "@types/mocha": "^5.2.7",
     "@types/nock": "^10.0.3",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nock": "^11.0.0",
diff --git a/packages/opentelemetry-metrics/package.json b/packages/opentelemetry-metrics/package.json
index a7db5104296..1ce12779a99 100644
--- a/packages/opentelemetry-metrics/package.json
+++ b/packages/opentelemetry-metrics/package.json
@@ -42,7 +42,7 @@
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
     "@types/sinon": "^7.0.13",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-metrics/src/LabelSet.ts b/packages/opentelemetry-metrics/src/LabelSet.ts
index c17534c2e78..fb038384bf0 100644
--- a/packages/opentelemetry-metrics/src/LabelSet.ts
+++ b/packages/opentelemetry-metrics/src/LabelSet.ts
@@ -28,12 +28,3 @@ export class LabelSet implements types.LabelSet {
     this.labels = labels;
   }
 }
-
-/**
- * Type guard to remove nulls from arrays
- *
- * @param value value to be checked for null equality
- */
-export function notNull<T>(value: T | null): value is T {
-  return value !== null;
-}
diff --git a/packages/opentelemetry-metrics/src/Metric.ts b/packages/opentelemetry-metrics/src/Metric.ts
index f3b50f2884a..e6bc268a80d 100644
--- a/packages/opentelemetry-metrics/src/Metric.ts
+++ b/packages/opentelemetry-metrics/src/Metric.ts
@@ -121,7 +121,8 @@ export abstract class Metric<T extends BaseHandle> implements types.Metric<T> {
 }
 
 /** This is a SDK implementation of Counter Metric. */
-export class CounterMetric extends Metric<CounterHandle> {
+export class CounterMetric extends Metric<CounterHandle>
+  implements Pick<types.MetricUtils, 'add'> {
   constructor(
     name: string,
     options: MetricOptions,
@@ -145,10 +146,20 @@ export class CounterMetric extends Metric<CounterHandle> {
       this._onUpdate
     );
   }
+
+  /**
+   * Adds the given value to the current value. Values cannot be negative.
+   * @param value the value to add.
+   * @param labelSet the canonicalized LabelSet used to associate with this metric's handle.
+   */
+  add(value: number, labelSet: types.LabelSet) {
+    this.getHandle(labelSet).add(value);
+  }
 }
 
 /** This is a SDK implementation of Gauge Metric. */
-export class GaugeMetric extends Metric<GaugeHandle> {
+export class GaugeMetric extends Metric<GaugeHandle>
+  implements Pick<types.MetricUtils, 'set'> {
   constructor(
     name: string,
     options: MetricOptions,
@@ -172,4 +183,13 @@ export class GaugeMetric extends Metric<GaugeHandle> {
       this._onUpdate
     );
   }
+
+  /**
+   * Sets the given value. Values can be negative.
+   * @param value the new value.
+   * @param labelSet the canonicalized LabelSet used to associate with this metric's handle.
+   */
+  set(value: number, labelSet: types.LabelSet) {
+    this.getHandle(labelSet).set(value);
+  }
 }
diff --git a/packages/opentelemetry-metrics/test/Meter.test.ts b/packages/opentelemetry-metrics/test/Meter.test.ts
index 06fd599abca..3e678d7ce4c 100644
--- a/packages/opentelemetry-metrics/test/Meter.test.ts
+++ b/packages/opentelemetry-metrics/test/Meter.test.ts
@@ -76,6 +76,14 @@ describe('Meter', () => {
       assert.ok(counter instanceof Metric);
     });
 
+    it('should be able to call add() directly on counter', () => {
+      const counter = meter.createCounter('name') as CounterMetric;
+      counter.add(10, labelSet);
+      assert.strictEqual(counter.getHandle(labelSet)['_data'], 10);
+      counter.add(10, labelSet);
+      assert.strictEqual(counter.getHandle(labelSet)['_data'], 20);
+    });
+
     describe('.getHandle()', () => {
       it('should create a counter handle', () => {
         const counter = meter.createCounter('name') as CounterMetric;
@@ -229,6 +237,14 @@ describe('Meter', () => {
       assert.ok(gauge instanceof Metric);
     });
 
+    it('should be able to call set() directly on gauge', () => {
+      const gauge = meter.createGauge('name') as GaugeMetric;
+      gauge.set(10, labelSet);
+      assert.strictEqual(gauge.getHandle(labelSet)['_data'], 10);
+      gauge.set(250, labelSet);
+      assert.strictEqual(gauge.getHandle(labelSet)['_data'], 250);
+    });
+
     describe('.getHandle()', () => {
       it('should create a gauge handle', () => {
         const gauge = meter.createGauge('name') as GaugeMetric;
diff --git a/packages/opentelemetry-node/package.json b/packages/opentelemetry-node/package.json
index 48a5910427c..46c8d593c02 100644
--- a/packages/opentelemetry-node/package.json
+++ b/packages/opentelemetry-node/package.json
@@ -44,8 +44,8 @@
     "@types/node": "^12.6.8",
     "@types/semver": "^6.0.1",
     "@types/shimmer": "^1.0.1",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "mocha": "^6.1.0",
     "nyc": "^14.1.1",
     "rimraf": "^3.0.0",
diff --git a/packages/opentelemetry-plugin-document-load/package.json b/packages/opentelemetry-plugin-document-load/package.json
index a7f615440a8..f002a2bb013 100644
--- a/packages/opentelemetry-plugin-document-load/package.json
+++ b/packages/opentelemetry-plugin-document-load/package.json
@@ -47,8 +47,8 @@
     "@types/sinon": "^7.0.13",
     "@types/webpack-env": "1.13.9",
     "babel-loader": "^8.0.6",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "istanbul-instrumenter-loader": "^3.0.1",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",
diff --git a/packages/opentelemetry-plugin-grpc/package.json b/packages/opentelemetry-plugin-grpc/package.json
index 9e14f27d0b5..a2f63e7348d 100644
--- a/packages/opentelemetry-plugin-grpc/package.json
+++ b/packages/opentelemetry-plugin-grpc/package.json
@@ -47,7 +47,7 @@
     "@types/semver": "^6.2.0",
     "@types/shimmer": "^1.0.1",
     "@types/sinon": "^7.0.13",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "grpc": "^1.23.3",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
diff --git a/packages/opentelemetry-plugin-http2/package.json b/packages/opentelemetry-plugin-http2/package.json
index 861e9b6d57b..063de1bcac5 100644
--- a/packages/opentelemetry-plugin-http2/package.json
+++ b/packages/opentelemetry-plugin-http2/package.json
@@ -42,7 +42,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-plugin-mongodb/package.json b/packages/opentelemetry-plugin-mongodb/package.json
index 1a78b4224e6..6c8b02219d7 100644
--- a/packages/opentelemetry-plugin-mongodb/package.json
+++ b/packages/opentelemetry-plugin-mongodb/package.json
@@ -42,7 +42,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg-pool/package.json b/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg-pool/package.json
index da7fbcca471..fc7aa348920 100644
--- a/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg-pool/package.json
+++ b/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg-pool/package.json
@@ -52,8 +52,8 @@
     "@types/pg": "^7.11.2",
     "@types/shimmer": "^1.0.1",
     "@types/pg-pool": "^2.0.1",
-    "codecov": "^3.5.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
     "rimraf": "^3.0.0",
diff --git a/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg/package.json b/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg/package.json
index 1508e87784e..09aefd38185 100644
--- a/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg/package.json
+++ b/packages/opentelemetry-plugin-postgres/opentelemetry-plugin-pg/package.json
@@ -12,7 +12,7 @@
     "test:local": "cross-env RUN_POSTGRES_TESTS_LOCAL=true yarn test",
     "tdd": "yarn test -- --watch-extensions ts --watch",
     "clean": "rimraf build/*",
-    "codecov": "nyc report --reporter=json && codecov -f coverage/*.json -p ../../",
+    "codecov": "nyc report --reporter=json && codecov -f coverage/*.json -p ../../../",
     "check": "gts check",
     "precompile": "tsc --version",
     "compile": "tsc -p .",
@@ -49,8 +49,8 @@
     "@types/node": "^12.6.9",
     "@types/pg": "^7.11.2",
     "@types/shimmer": "^1.0.1",
-    "codecov": "^3.5.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
     "pg": "^7.12.1",
diff --git a/packages/opentelemetry-plugin-redis/package.json b/packages/opentelemetry-plugin-redis/package.json
index 93af0e8e55c..baa86c0f4f5 100644
--- a/packages/opentelemetry-plugin-redis/package.json
+++ b/packages/opentelemetry-plugin-redis/package.json
@@ -42,7 +42,7 @@
   "devDependencies": {
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-scope-async-hooks/package.json b/packages/opentelemetry-scope-async-hooks/package.json
index fd1a5f562cd..452ffb10f9c 100644
--- a/packages/opentelemetry-scope-async-hooks/package.json
+++ b/packages/opentelemetry-scope-async-hooks/package.json
@@ -43,8 +43,8 @@
     "@types/mocha": "^5.2.5",
     "@types/node": "^12.6.8",
     "@types/shimmer": "^1.0.1",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "mocha": "^6.1.0",
     "nyc": "^14.1.1",
     "rimraf": "^3.0.0",
diff --git a/packages/opentelemetry-scope-base/package.json b/packages/opentelemetry-scope-base/package.json
index 635d10da61f..ef2733fffa3 100644
--- a/packages/opentelemetry-scope-base/package.json
+++ b/packages/opentelemetry-scope-base/package.json
@@ -43,8 +43,8 @@
   "devDependencies": {
     "@types/mocha": "^5.2.5",
     "@types/node": "^12.6.8",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "mocha": "^6.1.0",
     "nyc": "^14.1.1",
     "rimraf": "^3.0.0",
diff --git a/packages/opentelemetry-scope-zone-peer-dep/package.json b/packages/opentelemetry-scope-zone-peer-dep/package.json
index 0497800f462..81a3fbb9514 100644
--- a/packages/opentelemetry-scope-zone-peer-dep/package.json
+++ b/packages/opentelemetry-scope-zone-peer-dep/package.json
@@ -47,8 +47,8 @@
     "@types/webpack-env": "1.13.9",
     "@types/zone.js": "^0.5.12",
     "babel-loader": "^8.0.6",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "istanbul-instrumenter-loader": "^3.0.1",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",
diff --git a/packages/opentelemetry-scope-zone/package.json b/packages/opentelemetry-scope-zone/package.json
index 537571c6a45..c9d2976506e 100644
--- a/packages/opentelemetry-scope-zone/package.json
+++ b/packages/opentelemetry-scope-zone/package.json
@@ -43,8 +43,8 @@
     "@types/sinon": "^7.0.13",
     "@babel/core": "^7.6.0",
     "babel-loader": "^8.0.6",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "karma": "^4.1.0",
     "karma-chrome-launcher": "^2.2.0",
     "karma-mocha": "^1.3.0",
diff --git a/packages/opentelemetry-shim-opentracing/package.json b/packages/opentelemetry-shim-opentracing/package.json
index 482dbbe3d3b..5d2af4213fc 100644
--- a/packages/opentelemetry-shim-opentracing/package.json
+++ b/packages/opentelemetry-shim-opentracing/package.json
@@ -40,7 +40,7 @@
     "@opentelemetry/tracing": "^0.2.0",
     "@types/mocha": "^5.2.7",
     "@types/node": "^12.6.9",
-    "codecov": "^3.5.0",
+    "codecov": "^3.6.1",
     "gts": "^1.1.0",
     "mocha": "^6.2.0",
     "nyc": "^14.1.1",
diff --git a/packages/opentelemetry-tracing/package.json b/packages/opentelemetry-tracing/package.json
index ee8e205ddcb..6b0a1f3d540 100644
--- a/packages/opentelemetry-tracing/package.json
+++ b/packages/opentelemetry-tracing/package.json
@@ -50,8 +50,8 @@
     "@types/node": "^12.6.8",
     "@types/sinon": "^7.0.13",
     "@types/webpack-env": "1.13.9",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "istanbul-instrumenter-loader": "^3.0.1",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",
diff --git a/packages/opentelemetry-types/package.json b/packages/opentelemetry-types/package.json
index 58288c09c4b..4c5345abb54 100644
--- a/packages/opentelemetry-types/package.json
+++ b/packages/opentelemetry-types/package.json
@@ -41,7 +41,7 @@
     "access": "public"
   },
   "devDependencies": {
-    "gts": "^1.0.0",
+    "gts": "^1.1.0",
     "linkinator": "^1.5.0",
     "tslint-consistent-codestyle": "^1.15.1",
     "tslint-microsoft-contrib": "^6.2.0",
diff --git a/packages/opentelemetry-types/src/metrics/Metric.ts b/packages/opentelemetry-types/src/metrics/Metric.ts
index 0c011d3811c..a1e18e4fadc 100644
--- a/packages/opentelemetry-types/src/metrics/Metric.ts
+++ b/packages/opentelemetry-types/src/metrics/Metric.ts
@@ -14,6 +14,9 @@
  * limitations under the License.
  */
 
+import { DistributedContext } from '../distributed_context/DistributedContext';
+import { SpanContext } from '../trace/span_context';
+
 /**
  * Options needed for metric creation
  */
@@ -99,6 +102,36 @@ export interface Metric<T> {
   setCallback(fn: () => void): void;
 }
 
+export interface MetricUtils {
+  /**
+   * Adds the given value to the current value. Values cannot be negative.
+   */
+  add(value: number, labelSet: LabelSet): void;
+
+  /**
+   * Sets the given value. Values can be negative.
+   */
+  set(value: number, labelSet: LabelSet): void;
+
+  /**
+   * Records the given value to this measure.
+   */
+  record(value: number, labelSet: LabelSet): void;
+
+  record(
+    value: number,
+    labelSet: LabelSet,
+    distContext: DistributedContext
+  ): void;
+
+  record(
+    value: number,
+    labelSet: LabelSet,
+    distContext: DistributedContext,
+    spanContext: SpanContext
+  ): void;
+}
+
 /**
  * key-value pairs passed by the user.
  */
diff --git a/packages/opentelemetry-web/package.json b/packages/opentelemetry-web/package.json
index 188f0df5b37..08e9b3c99e9 100644
--- a/packages/opentelemetry-web/package.json
+++ b/packages/opentelemetry-web/package.json
@@ -47,8 +47,8 @@
     "@types/sinon": "^7.0.13",
     "@types/webpack-env": "1.13.9",
     "babel-loader": "^8.0.6",
-    "codecov": "^3.1.0",
-    "gts": "^1.0.0",
+    "codecov": "^3.6.1",
+    "gts": "^1.1.0",
     "istanbul-instrumenter-loader": "^3.0.1",
     "karma": "^4.4.1",
     "karma-chrome-launcher": "^3.1.0",