mention cal_logs in docs

docs/jwst/stpipe/user_logging.rst

@@ -109,3 +109,30 @@ hitting any warning for that Step:
     level = INFO
     break_level = WARNING
 
+.. _cal_logs:
+
+DataModel cal_logs
+==================
+
+Saved files that contain :ref:`jwst-data-models` will contain log messages
+from the run that produced the file. These are stored in the ASDF portion
+of the file and can be inspected by opening the file as a
+:ref:`jwst-data-models`.
+
+The ``cal_logs`` attribute contains log messages as lists of strings
+organized by step or pipeline name. For example to see log messages from
+:ref:`calwebb_detector1`:
+
+::
+
+        import stdatamodels.jwst.datamodels as dm
+        model = dm.open("jw00001001001_01101_00001_mirimage_cal.fits")
+        print(model.cal_logs.calwebb_detector1)
+
+Files processed by a pipeline will contain all logs messages for that
+run under the pipeline name (and not contain ``cal_logs`` for individual
+steps that were part of the pipeline).
+
+Log messages that contain sensitive information (user, hostname, paths,
+IP addresses) are replaced with empty strings. Please see the console
+logs for those messages.