diff --git a/Core/PixelEvent.swift b/Core/PixelEvent.swift
index 300b2b63a1..7c1cc45b99 100644
--- a/Core/PixelEvent.swift
+++ b/Core/PixelEvent.swift
@@ -535,7 +535,8 @@ extension Pixel {
         case debugCannotClearObservationsDatabase
         case debugWebsiteDataStoresNotClearedMultiple
         case debugWebsiteDataStoresNotClearedOne
-        
+        case debugWebsiteDataStoresCleared
+
         case debugBookmarksMigratedMoreThanOnce
         
         // Return user measurement
@@ -1243,7 +1244,8 @@ extension Pixel.Event {
         case .debugCannotClearObservationsDatabase: return "m_d_cannot_clear_observations_database"
         case .debugWebsiteDataStoresNotClearedMultiple: return "m_d_wkwebsitedatastoresnotcleared_multiple"
         case .debugWebsiteDataStoresNotClearedOne: return "m_d_wkwebsitedatastoresnotcleared_one"
-            
+        case .debugWebsiteDataStoresCleared: return "m_d_wkwebsitedatastorescleared"
+
             // MARK: Ad Attribution
             
         case .adAttributionGlobalAttributedRulesDoNotExist: return "m_attribution_global_attributed_rules_do_not_exist"
diff --git a/Core/WebCacheManager.swift b/Core/WebCacheManager.swift
index 682afae536..91a10c0781 100644
--- a/Core/WebCacheManager.swift
+++ b/Core/WebCacheManager.swift
@@ -96,12 +96,18 @@ public class WebCacheManager {
 extension WebCacheManager {
 
     @available(iOS 17, *)
-    private func checkForLeftBehindDataStores() async {
+    private func checkForLeftBehindDataStores(leftOversCount: Int) async {
+        let params = [
+            "left_overs_count": "\(leftOversCount)"
+        ]
+
         let ids = await WKWebsiteDataStore.allDataStoreIdentifiers
         if ids.count > 1 {
-            Pixel.fire(pixel: .debugWebsiteDataStoresNotClearedMultiple)
+            Pixel.fire(pixel: .debugWebsiteDataStoresNotClearedMultiple, withAdditionalParameters: params)
         } else if ids.count > 0 {
-            Pixel.fire(pixel: .debugWebsiteDataStoresNotClearedOne)
+            Pixel.fire(pixel: .debugWebsiteDataStoresNotClearedOne, withAdditionalParameters: params)
+        } else if leftOversCount > 0 {
+            Pixel.fire(pixel: .debugWebsiteDataStoresCleared, withAdditionalParameters: params)
         }
     }
 
@@ -113,10 +119,11 @@ extension WebCacheManager {
         dataStore = nil
 
         let uuids = await WKWebsiteDataStore.allDataStoreIdentifiers
+        let count = max(0, uuids.count - 1) // -1 because there should be a current store
         for uuid in uuids {
             try? await WKWebsiteDataStore.remove(forIdentifier: uuid)
         }
-        await checkForLeftBehindDataStores()
+        await checkForLeftBehindDataStores(leftOversCount: count)
 
         storeIdManager.allocateNewContainerId()
         return cookies