# `GSFontMaster blueValuesMetrics:doFallback:error:`

*Instance Method*

## Declaration

```swift
func blueValuesMetrics(_ metricStores: [GSMetric], doFallback: Bool) throws -> [NSNumber]
```

```objc
- (NSArray<NSNumber *> *) blueValuesMetrics:(NSArray<GSMetric *> *) metricStores doFallback:(BOOL) doFallback error:(NSError **) error;
```

```python
blueValuesMetrics_doFallback_error_(metricStores: list[GSMetric], doFallback: bool) -> tuple[list[NSNumber], NSError]
```