Change logging to debug level and add more details to prevent confusi…

…on (#1300)

What changed?
Change warning message for unknown event type to debug level

Why?
It's creating too much warning log that overwhelm system

How did you test it?
Unit test

Potential risks
Only remove logger so no danger

internal/internal_utils.go

@@ -468,10 +468,8 @@ func estimateHistorySize(logger *zap.Logger, event *s.HistoryEvent) int {
 			sum += len(event.SignalExternalWorkflowExecutionInitiatedEventAttributes.Control)
 			sum += len(event.SignalExternalWorkflowExecutionInitiatedEventAttributes.Input)
 		}
-
 	default:
-		logger.Warn("unknown event type", zap.String("Event Type", event.GetEventType().String()))
-		// Do not fail to be forward compatible with new events
+		logger.Debug("unsupported event type for history size estimation", zap.String("Event Type", event.GetEventType().String()))
 	}
 
 	return sum