diff --git a/app/common/Telemetry.ts b/app/common/Telemetry.ts
index 328a3c7e..aab28a27 100644
--- a/app/common/Telemetry.ts
+++ b/app/common/Telemetry.ts
@@ -1746,7 +1746,7 @@ export const TelemetryContracts: TelemetryContracts = {
     minimumTelemetryLevel: Level.limited,
     retentionPeriod: 'indefinitely',
     metadataContracts: {
-      installationId: {
+      deploymentId: {
         description: 'The installation id of the client.',
         dataType: 'string',
       },
diff --git a/app/server/lib/Telemetry.ts b/app/server/lib/Telemetry.ts
index edef1912..6d341600 100644
--- a/app/server/lib/Telemetry.ts
+++ b/app/server/lib/Telemetry.ts
@@ -334,6 +334,17 @@ export class Telemetry implements ITelemetry {
     try {
       this._numPendingForwardEventRequests += 1;
       const {category: eventCategory} = TelemetryContracts[event];
+
+      if (metadata) {
+        if ('installationId' in metadata ||
+            'eventSource' in metadata ||
+            'eventName' in metadata ||
+            'eventCategory' in metadata)
+        {
+          throw new Error('metadata contains reserved keys');
+        }
+      }
+
       await this._doForwardEvent(JSON.stringify({
         event,
         metadata: {
diff --git a/app/server/lib/UpdateManager.ts b/app/server/lib/UpdateManager.ts
index 47556b74..c7ac9f67 100644
--- a/app/server/lib/UpdateManager.ts
+++ b/app/server/lib/UpdateManager.ts
@@ -86,7 +86,7 @@ export class UpdateManager {
 
       // This is the most interesting part for us, to track installation ids and match them
       // with the version of the client. Won't be send without telemetry opt in.
-      const installationId = optStringParam(
+      const deploymentId = optStringParam(
         payload("installationId"),
         "installationId"
       );
@@ -104,8 +104,8 @@ export class UpdateManager {
         .getTelemetry()
         .logEvent(req as RequestWithLogin, "checkedUpdateAPI", {
           full: {
-            installationId,
-            deploymentType,
+            deploymentId,
+            deploymentType
           },
         });