Fix CI test failure in test_port_manager_high_queue_utilization_warning

Author: littlebullGit

src/lightning/fabric/utilities/port_manager.py

@@ -231,8 +231,10 @@ def allocate_port(self, preferred_port: Optional[int] = None, max_attempts: int
 
                     self._allocated_ports.add(port)
 
+                    # Log diagnostics if queue utilization is high (>78%)
                     queue_count = len(state.recently_released)
-                    if queue_count > 800:  # >78% of typical 1024 capacity
+                    threshold = int(_RECENTLY_RELEASED_PORTS_MAXLEN * 0.78)
+                    if queue_count > threshold:
                         utilization_pct = (queue_count / _RECENTLY_RELEASED_PORTS_MAXLEN) * 100
                         log.warning(
                             f"Port queue utilization high: {queue_count} entries ({utilization_pct:.1f}% of capacity). "

tests/tests_fabric/utilities/test_port_manager.py

@@ -784,17 +784,21 @@ def test_port_manager_reserve_clears_recently_released():
     manager.release_port(port)
 
 
-def test_port_manager_high_queue_utilization_warning(monkeypatch, caplog):
+def test_port_manager_high_queue_utilization_warning(monkeypatch, caplog, tmpdir):
     """Test that warning is logged when queue utilization exceeds 80%."""
     import logging
+    from pathlib import Path
 
     _set_recently_released_limit(monkeypatch, 64)
 
     queue_limit = port_manager_module._RECENTLY_RELEASED_PORTS_MAXLEN
     trigger_count = int(queue_limit * 0.8) + 1  # Just over 80%
     expected_pct = (trigger_count / queue_limit) * 100
 
-    manager = PortManager()
+    # Use isolated state to avoid contamination from other tests
+    lock_file = Path(tmpdir) / "test.lock"
+    state_file = Path(tmpdir) / "test_state.json"
+    manager = PortManager(lock_file=lock_file, state_file=state_file)
 
     # Fill queue to just over 80%
     for _ in range(trigger_count):