SIENTIAPDE-1478

Refactor timestamp normalization in API class to handle NaN values correctly by dropping them before calculating the maximum timestamp.

scouter/activities/api.py

@@ -136,13 +136,14 @@ class API(SientiaMonitoring):
             )
             raise e
 
+
         latest_values['timestamp'] = latest_values['timestamp'].dt.strftime(DATETIME_FORMAT_WITH_TZ)
 
         self.debug(f'Latest values: {latest_values.to_string()}', metadata=metadata)
 
         # Normalize the package timestamp
-        latest_values['timestamp'] = latest_values['timestamp'].max()
-
+        valid_timestamp_values = latest_values['timestamp'].dropna()
+        latest_values['timestamp'] = valid_timestamp_values.max()
         
         self.info(f'Gathered {len(latest_values)} tag values', metadata=metadata)