}

	if dir == "" {
		if !dirSet {
			return nil, fmt.Errorf("missing option must be provided")
		}
		return nil, fmt.Errorf("provided option cannot be empty")
	}

	// Disallow relative paths, figure out absolute paths.
	dirAbs, err := filepath.Abs(dir)
	if err != nil {
		return nil, err
	}
	err = mkdirAllIgnorePerm(dirAbs)
	if err != nil {

# Metrics Version 3

In metrics version 3, all metrics are available under the endpoint:

```
/minio/metrics/v3
```

however, a specific path under this is required.

Metrics are organized into groups at paths **relative** to the top-level endpoint above.

## Metrics Request Handling

Each endpoint below can be queried at different intervals as needed via a scrape configuration in Prometheus or a compatible metrics collection tool.

// bucket dimension. For metric groups with a bucket dimension, use the
// `GetBucketCollector` method to get a `BucketCollector` that implements the
// prometheus.Collector interface.
type MetricsGroup struct {
	// Path (relative to the Metrics v3 base endpoint) at which this group of
	// metrics is served. This value is converted into a metric name prefix
	// using `.metricPrefix()` and is added to each metric returned.
	CollectorPath collectorPath