Investigate memory leak (#19213)

In search for cache leak + Remove old instrumentation

packages/twenty-server/src/engine/workspace-cache/services/workspace-cache.service.ts

@@ -94,6 +94,36 @@ export class WorkspaceCacheService implements OnModuleInit {
         }
       }
     }
+
+    setInterval(() => {
+      const stats = this.getStats();
+
+      this.logger.log(
+        `Cache stats: localCacheSize=${stats.localCacheSize} memoizerCacheSize=${stats.memoizerCacheSize} memoizerPendingSize=${stats.memoizerPendingSize} entriesByKey=${JSON.stringify(stats.entriesByKey)} versionsByKey=${JSON.stringify(stats.versionsByKey)}`,
+      );
+    }, 60_000).unref();
+  }
+
+  public getStats() {
+    const memoizerSize = this.memoizer.getSize();
+    const entriesByKey: Record<string, number> = {};
+    const versionsByKey: Record<string, number> = {};
+
+    for (const [key, entry] of this.localCache.entries()) {
+      const prefix = key.substring(0, key.lastIndexOf(':'));
+
+      entriesByKey[prefix] = (entriesByKey[prefix] ?? 0) + 1;
+      versionsByKey[prefix] =
+        (versionsByKey[prefix] ?? 0) + entry.versions.size;
+    }
+
+    return {
+      localCacheSize: this.localCache.size,
+      memoizerCacheSize: memoizerSize.cache,
+      memoizerPendingSize: memoizerSize.pending,
+      entriesByKey,
+      versionsByKey,
+    };
   }
 
   public async getOrRecompute<const K extends WorkspaceCacheKeyName[]>(