fix(simple_metrics): ignore invalid simple_metrics_min_samples; tighten tests and docs (SIENTIAPDE-2189)

laborious/workflows/simple_metrics.py

@@ -34,6 +34,14 @@ class SimpleMetrics:
         model_type = model_config.get('model_type')
         thresholds = model_config.get('simple_metrics_thresholds')
         min_samples = model_config.get('simple_metrics_min_samples')
+        # Untyped Mongo config: anything but a positive int (bool excluded) turns the guard off
+        # instead of raising in workflow code; falsy values mean "unset" and stay silent.
+        if type(min_samples) is not int or min_samples <= 0:
+            if min_samples:
+                workflow.logger.warning(
+                    f'Invalid simple_metrics_min_samples={min_samples!r}: min samples guard off'
+                )
+            min_samples = None
 
         # Built from internal Temporal workflow config, not user input (bandit B608).
         query = f"""