group rollbar messages around just the exception title

cli/dcoscli/analytics.py

@@ -211,8 +211,15 @@ def _rollbar_track_err(conf, err, exit_code):
     props = _base_properties(conf)
     props['exit_code'] = exit_code
 
+    lines = err.split('\n')
+    if len(lines) >= 2:
+        title = lines[-2]
+    else:
+        title = err
+    props['stderr'] = err
+
     try:
-        rollbar.report_message(err, 'error', extra_data=props)
+        rollbar.report_message(title, 'error', extra_data=props)
     except Exception as e:
         logger.exception(e)
 

cli/tests/data/analytics/dcos_reporting.toml

@@ -1,3 +1,3 @@
 [core]
-reporting = true
 email = "test@mail.com"
+reporting = true

cli/tests/integrations/test_analytics.py

@@ -93,6 +93,7 @@ def test_exc():
         # rollbar
         props = _base_properties()
         props['exit_code'] = 1
+        props['stderr'] = 'Traceback'
         rollbar.report_message.assert_called_with('Traceback', 'error',
                                                   extra_data=props)