Changing metric index to 'default' at setup
Needed to enable automatic creation of new entries in dict on set
'default' is  a magical word that should be used for all dynamic dicts in the sc schema
@@ -2070,7 +2070,7 @@ def schema_arg(cfg):
# Metrics to Track
###########################################################################
-def schema_metric(cfg, group='default', step='default', index='0'):
+def schema_metric(cfg, group='default', step='default', index='default'):
if not 'metric' in cfg:
cfg['metric'] = {}
