diff --git a/packages/vercel-flags-core/src/black-box.test.ts b/packages/vercel-flags-core/src/black-box.test.ts
index f8ca008a..b4b5b38a 100644
--- a/packages/vercel-flags-core/src/black-box.test.ts
+++ b/packages/vercel-flags-core/src/black-box.test.ts
@@ -205,6 +205,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'build',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -246,6 +249,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'build',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -346,6 +352,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -420,6 +429,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'build',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -1189,6 +1201,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'offline',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -1265,6 +1280,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'offline',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -2126,6 +2144,9 @@ describe('Controller (black-box)', () => {
                   cacheIsBlocking: false,
                   duration: 0,
                   configUpdatedAt: 1,
+                  mode: 'stream',
+                  revision: '1',
+                  environment: 'test',
                 },
               },
             ]),
@@ -2497,6 +2518,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 2000,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -3166,6 +3190,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -3229,6 +3256,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
             {
@@ -3241,6 +3271,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
             {
@@ -3253,6 +3286,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -3405,6 +3441,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'offline',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -3624,6 +3663,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 2,
+                mode: 'build',
+                revision: '2',
+                environment: 'test',
               },
             },
           ]),
@@ -3665,6 +3707,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 1,
+                mode: 'build',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -3728,6 +3773,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 5,
+                mode: 'stream',
+                revision: '1',
+                environment: 'test',
               },
             },
           ]),
@@ -3784,6 +3832,9 @@ describe('Controller (black-box)', () => {
                 cacheIsBlocking: false,
                 duration: 0,
                 configUpdatedAt: 2,
+                mode: 'build',
+                revision: '2',
+                environment: 'test',
               },
             },
           ]),
diff --git a/packages/vercel-flags-core/src/controller/index.ts b/packages/vercel-flags-core/src/controller/index.ts
index d0dbe929..ee8bc35c 100644
--- a/packages/vercel-flags-core/src/controller/index.ts
+++ b/packages/vercel-flags-core/src/controller/index.ts
@@ -784,17 +784,24 @@ export class Controller implements ControllerInterface {
         : this.state === 'polling'
           ? 'REFRESHING'
           : 'NONE';
+    const mode = this.mode;
     const trackOptions: TrackReadOptions = {
       configOrigin,
       cacheStatus: cacheHadDefinitions ? 'HIT' : 'MISS',
       cacheAction,
       cacheIsBlocking: !cacheHadDefinitions,
       duration: Date.now() - startTime,
+      mode:
+        mode === 'streaming' ? 'stream' : mode === 'polling' ? 'poll' : mode,
     };
     const configUpdatedAt = this.data?.configUpdatedAt;
     if (typeof configUpdatedAt === 'number') {
       trackOptions.configUpdatedAt = configUpdatedAt;
     }
+    const revision = this.data?.revision;
+    if (typeof revision === 'number') {
+      trackOptions.revision = revision;
+    }
     if (isFirstRead) {
       trackOptions.cacheIsFirstRead = true;
     }
diff --git a/packages/vercel-flags-core/src/utils/usage-tracker.ts b/packages/vercel-flags-core/src/utils/usage-tracker.ts
index 1d6c5654..63436ec6 100644
--- a/packages/vercel-flags-core/src/utils/usage-tracker.ts
+++ b/packages/vercel-flags-core/src/utils/usage-tracker.ts
@@ -18,13 +18,16 @@ export interface FlagsConfigReadEvent {
     region?: string;
     invocationHost?: string;
     vercelRequestId?: string;
-    cacheStatus?: 'HIT' | 'MISS' | 'BYPASS';
+    cacheStatus?: 'HIT' | 'MISS' | 'BYPASS' | 'STALE';
     cacheAction?: 'REFRESHING' | 'FOLLOWING' | 'NONE';
     cacheIsBlocking?: boolean;
     cacheIsFirstRead?: boolean;
     duration?: number;
     configUpdatedAt?: number;
-    configOrigin?: 'in-memory' | 'embedded';
+    configOrigin?: 'in-memory' | 'embedded' | 'poll' | 'stream' | 'constructor';
+    mode?: 'poll' | 'stream' | 'build' | 'offline';
+    revision?: string;
+    environment?: string;
   };
 }
 
@@ -91,6 +94,10 @@ export interface TrackReadOptions {
   duration?: number;
   /** Timestamp when the config was last updated */
   configUpdatedAt?: number;
+  /** The mode the SDK is operating in */
+  mode?: 'poll' | 'stream' | 'build' | 'offline';
+  /** Revision of the config */
+  revision?: number;
 }
 
 /**
@@ -174,6 +181,18 @@ export class UsageTracker {
         if (options.configUpdatedAt !== undefined) {
           event.payload.configUpdatedAt = options.configUpdatedAt;
         }
+        if (options.mode !== undefined) {
+          event.payload.mode = options.mode;
+        }
+        if (options.revision !== undefined) {
+          event.payload.revision = String(options.revision);
+        }
+      }
+
+      const environment =
+        process.env.VERCEL_ENV || process.env.NODE_ENV || undefined;
+      if (environment) {
+        event.payload.environment = environment;
       }
 
       this.batcher.events.push(event);
@@ -266,6 +285,7 @@ export class UsageTracker {
         debugLog(
           '@vercel/flags-core: Failed to send events:',
           response.statusText,
+          await response.text(),
         );
         this.requeue(eventsToSend);
       }