diff --git a/applicationinsights/applicationinsights.d.ts b/applicationinsights/applicationinsights.d.ts
index 6b80adc2ac..12dffdd81c 100644
--- a/applicationinsights/applicationinsights.d.ts
+++ b/applicationinsights/applicationinsights.d.ts
@@ -4,21 +4,25 @@
 // Definitions: https://github.com/borisyankov/DefinitelyTyped
 
 interface AutoCollectConsole {
+    constructor(client: Client): AutoCollectConsole;
     enable(isEnabled: boolean): void;
     isInitialized(): boolean;
 }
 
 interface AutoCollectExceptions {
+    constructor(client:Client): AutoCollectExceptions;
     isInitialized(): boolean;
     enable(isEnabled:boolean): void;
 }
 
 interface AutoCollectPerformance {
+    constructor(client: Client): AutoCollectPerformance;
     enable(isEnabled: boolean): void;
     isInitialized(): boolean;
 }
 
 interface AutoCollectRequests {
+    constructor(client: Client): AutoCollectRequests;
     enable(isEnabled: boolean): void;
     isInitialized(): boolean;
 }
@@ -85,14 +89,17 @@ declare module ContractsModule {
         sampleRate: string;
         internalSdkVersion: string;
         internalAgentVersion: string;
+        constructor(): ContextTagKeys;
     }
     interface Domain {
         ver: number;
         properties: any;
+        constructor(): Domain;
     }
     interface Data<TDomain extends ContractsModule.Domain> {
         baseType: string;
         baseData: TDomain;
+        constructor(): Data<TDomain>;
     }
     interface Envelope {
         ver: number;
@@ -112,18 +119,21 @@ declare module ContractsModule {
             [key: string]: string;
         };
         data: Data<Domain>;
+        constructor(): Envelope;
     }
     interface EventData extends ContractsModule.Domain {
         ver: number;
         name: string;
         properties: any;
         measurements: any;
+        constructor(): EventData;
     }
     interface MessageData extends ContractsModule.Domain {
         ver: number;
         message: string;
         severityLevel: ContractsModule.SeverityLevel;
         properties: any;
+        constructor(): MessageData;
     }
     interface ExceptionData extends ContractsModule.Domain {
         ver: number;
@@ -134,6 +144,7 @@ declare module ContractsModule {
         crashThreadId: number;
         properties: any;
         measurements: any;
+        constructor(): ExceptionData;
     }
     interface StackFrame {
         level: number;
@@ -141,6 +152,7 @@ declare module ContractsModule {
         assembly: string;
         fileName: string;
         line: number;
+        constructor(): StackFrame;
     }
     interface ExceptionDetails {
         id: number;
@@ -150,6 +162,7 @@ declare module ContractsModule {
         hasFullStack: boolean;
         stack: string;
         parsedStack: StackFrame[];
+        constructor(): ExceptionDetails;
     }
     interface DataPoint {
         name: string;
@@ -159,11 +172,13 @@ declare module ContractsModule {
         min: number;
         max: number;
         stdDev: number;
+        constructor(): DataPoint;
     }
     interface MetricData extends ContractsModule.Domain {
         ver: number;
         metrics: DataPoint[];
         properties: any;
+        constructor(): MetricData;
     }
     interface PageViewData extends ContractsModule.EventData {
         ver: number;
@@ -172,6 +187,7 @@ declare module ContractsModule {
         duration: string;
         properties: any;
         measurements: any;
+        constructor(): PageViewData;
     }
     interface PageViewPerfData extends ContractsModule.PageViewData {
         ver: number;
@@ -185,6 +201,7 @@ declare module ContractsModule {
         domProcessing: string;
         properties: any;
         measurements: any;
+        constructor(): PageViewPerfData;
     }
     interface RemoteDependencyData extends ContractsModule.Domain {
         ver: number;
@@ -202,6 +219,7 @@ declare module ContractsModule {
         commandName: string;
         dependencyTypeName: string;
         properties: any;
+        constructor(): RemoteDependencyData;
     }
     interface AjaxCallData extends ContractsModule.PageViewData {
         ver: number;
@@ -218,6 +236,7 @@ declare module ContractsModule {
         success: boolean;
         properties: any;
         measurements: any;
+        constructor(): AjaxCallData;
     }
     interface RequestData extends ContractsModule.Domain {
         ver: number;
@@ -231,10 +250,12 @@ declare module ContractsModule {
         url: string;
         properties: any;
         measurements: any;
+        constructor(): RequestData;
     }
     interface SessionStateData extends ContractsModule.Domain {
         ver: number;
         state: ContractsModule.SessionState;
+        constructor(): SessionStateData;
     }
     interface PerformanceCounterData extends ContractsModule.Domain {
         ver: number;
@@ -248,6 +269,7 @@ declare module ContractsModule {
         stdDev: number;
         value: number;
         properties: any;
+        constructor(): PerformanceCounterData;
     }
 }
 
@@ -309,10 +331,14 @@ interface Client {
      * Log a numeric value that is not associated with a specific event. Typically used to send regular reports of performance indicators.
      * To send a single measurement, use just the first two parameters. If you take measurements very frequently, you can reduce the
      * telemetry bandwidth by aggregating multiple measurements and sending the resulting average at intervals.
-     * @param   name    A string that identifies the metric.
-     * @param   value The value of the metric
+     * @param name   A string that identifies the metric.
+     * @param value  The value of the metric
+     * @param count  the number of samples used to get this value
+     * @param min    the min sample for this set
+     * @param max    the max sample for this set
+     * @param stdDev the standard deviation of the set
      */
-    trackMetric(name: string, value: number): void;
+    trackMetric(name: string, value: number, count?:number, min?: number, max?: number, stdDev?: number): void;
     trackRequest(request: any /* http.ServerRequest */, response: any /* http.ServerResponse */, properties?: {
         [key: string]: string;
     }): void;
@@ -381,10 +407,16 @@ declare class ApplicationInsights {
     private static _performance;
     private static _requests;
     private static _isStarted;
+    /**
+     * Initializes a client with the given instrumentation key, if this is not specified, the value will be
+     * read from the environment variable APPINSIGHTS_INSTRUMENTATIONKEY
+     * @returns {ApplicationInsights/Client} a new client
+     */
+    static getClient(instrumentationKey?: string): Client;
     /**
      * Initializes the default client of the client and sets the default configuration
      * @param instrumentationKey the instrumentation key to use. Optional, if this is not specified, the value will be
-     * read from the environment variable APPINSIGHTS_INSTRUMENTATION_KEY
+     * read from the environment variable APPINSIGHTS_INSTRUMENTATIONKEY
      * @returns {ApplicationInsights} this interface
      */
     static setup(instrumentationKey?: string): typeof ApplicationInsights;