Fix logging of the %(check_perfvalues)s attribute

Author: vkarak

reframe/core/pipeline.py

@@ -1268,8 +1268,7 @@ def set_var_default(self, name, value):
     @loggable
     @property
     def perfvalues(self):
-        return self._perfvalues
-        # return util.MappingView(self._perfvalues)
+        return util.MappingView(self._perfvalues)
 
     @property
     def job(self):

reframe/utility/__init__.py

@@ -1473,6 +1473,9 @@ def __repr__(self):
     def __str__(self):
         return str(self.__container)
 
+    def __rfm_json_encode__(self):
+        return self.__container
+
 
 class MappingView(collections.abc.Mapping):
     '''A read-only view of a mapping.
@@ -1535,3 +1538,6 @@ def __repr__(self):
 
     def __str__(self):
         return str(self.__mapping)
+
+    def __rfm_json_encode__(self):
+        return self.__mapping

tutorials/cscs-webinar-2022/config/mysettings.py

@@ -154,7 +154,7 @@
                         'ref=%(check_perf_ref)s '
                         '(l=%(check_perf_lower_thres)s, '
                         'u=%(check_perf_upper_thres)s)|'
-                        '%(check_perf_unit)s|%(check_perfvalues)s'
+                        '%(check_perf_unit)s'
                     ),
                     'append': True
                 }