diff --git a/ax/preview/api/client.py b/ax/preview/api/client.py
index 8d4ad6ed150..ba750eeebad 100644
--- a/ax/preview/api/client.py
+++ b/ax/preview/api/client.py
@@ -21,6 +21,7 @@
 )
 from ax.analysis.utils import choose_analyses
 from ax.core.experiment import Experiment
+from ax.core.map_metric import MapMetric
 from ax.core.metric import Metric
 from ax.core.objective import MultiObjective, Objective, ScalarizedObjective
 from ax.core.observation import ObservationFeatures
@@ -438,6 +439,11 @@ def attach_data(
         Saves to database on completion if storage_config is present.
         """
 
+        # If any metric is not present on the Experiment, add it as a tracking metric
+        for metric_name in raw_data.keys():
+            if metric_name not in self._experiment.metrics:
+                self._experiment.add_tracking_metric(metric=MapMetric(name=metric_name))
+
         # If no progression is provided assume the data is not timeseries-like and
         # set step=NaN
         data_with_progression = [