improved logging

python_app/gui/controllers/app_window_pipeline_mixin.py

@@ -304,16 +304,22 @@ class AppWindowPipelineMixin:
             self._log("All pipeline processes stopped")
 
     def _close_readers(self, *, keep_results: bool = False) -> None:
-        """Close active ring readers."""
+        """Close active ring readers; keep the results reader when ``keep_results``."""
+        closed = []
         if self._raw_reader is not None:
             self._raw_reader.close()
             self._raw_reader = None
+            closed.append("raw")
         if self._pre_reader is not None:
             self._pre_reader.close()
             self._pre_reader = None
+            closed.append("preprocessed")
         if not keep_results and self._result_reader is not None:
             self._result_reader.close()
             self._result_reader = None
+            closed.append("results")
+        if closed:
+            self._log_debug(f"Closed ring readers: {', '.join(closed)}.")
 
     def _poll_rings(self) -> None:
         """Poll readers, ingest history, and trigger rendering."""