diff --git a/src/Utils/event-buffer.ts b/src/Utils/event-buffer.ts
index b701542f..5ae8614b 100644
--- a/src/Utils/event-buffer.ts
+++ b/src/Utils/event-buffer.ts
@@ -482,6 +482,10 @@ export const makeEventBuffer = (
 				removed: removed.length,
 				remaining: historyCache.size
 			})
+			// Record metrics for cache cleanup
+			if (metricsModule) {
+				metricsModule.recordCacheCleanup(removed.length)
+			}
 		}
 	}
 
diff --git a/src/Utils/prometheus-metrics.ts b/src/Utils/prometheus-metrics.ts
index d5690329..3708f456 100644
--- a/src/Utils/prometheus-metrics.ts
+++ b/src/Utils/prometheus-metrics.ts
@@ -1898,6 +1898,18 @@ export function updateBufferStatistics(stats: {
 	}
 }
 
+/**
+ * Record a cache cleanup operation
+ * Used by event-buffer.ts when LRU cleanup is performed
+ */
+export function recordCacheCleanup(removedCount: number): void {
+	try {
+		metrics.bufferCacheCleanup?.inc({})
+	} catch {
+		// Metrics not initialized, ignore silently
+	}
+}
+
 // ============================================
 // Global Instance
 // ============================================