the fix

services/autoscaling/src/simcore_service_autoscaling/models.py

@@ -1,6 +1,6 @@
 from collections import defaultdict
 from collections.abc import Generator
-from dataclasses import dataclass, field
+from dataclasses import dataclass, field, fields
 from typing import Any, TypeAlias
 
 from aws_library.ec2 import EC2InstanceData, EC2InstanceType, Resources
@@ -212,3 +212,13 @@ class BufferPoolManager:
 
     def __repr__(self) -> str:
         return f"BufferPoolManager({dict(self.buffer_pools)})"
+
+    def flatten_buffer_pool(self) -> BufferPool:
+        """returns a flattened buffer pool with all the EC2InstanceData"""
+        flat_pool = BufferPool()
+
+        for buffer_pool in self.buffer_pools.values():
+            for f in fields(BufferPool):
+                getattr(flat_pool, f.name).update(getattr(buffer_pool, f.name))
+
+        return flat_pool

services/autoscaling/src/simcore_service_autoscaling/modules/instrumentation/_models.py

@@ -154,13 +154,14 @@ def __post_init__(self) -> None:
     def update_from_buffer_pool_manager(
         self, buffer_pool_manager: BufferPoolManager
     ) -> None:
-        for buffer_pool in buffer_pool_manager.buffer_pools.values():
-            for field_name in BUFFER_POOLS_METRICS_DEFINITIONS:
-                tracked_gauge = getattr(self, field_name)
-                assert isinstance(tracked_gauge, TrackedGauge)  # nosec
-                instances = getattr(buffer_pool, field_name)
-                assert isinstance(instances, set)  # nosec
-                tracked_gauge.update_from_instances(instances)
+        flat_pool = buffer_pool_manager.flatten_buffer_pool()
+
+        for field_name in BUFFER_POOLS_METRICS_DEFINITIONS:
+            tracked_gauge = getattr(self, field_name)
+            assert isinstance(tracked_gauge, TrackedGauge)  # nosec
+            instances = getattr(flat_pool, field_name)
+            assert isinstance(instances, set)  # nosec
+            tracked_gauge.update_from_instances(instances)
 
 
 @dataclass(slots=True, kw_only=True)