func (sv SupportedVersions) NextVersionPair(current *EtcdVersionPair) *EtcdVersionPair {
	nextVersion := sv.NextVersion(current.version)
	if nextVersion == nil {
		return nil
	}
	storageVersion := storageEtcd3
	if nextVersion.Major == 2 {
		storageVersion = storageEtcd2
	}
	return &EtcdVersionPair{version: nextVersion, storageVersion: storageVersion}
}

// ParseSupportedVersions parses a list of etcd versions.

	// and if it has a different alias we should use that a cluster ID for proxy.
	ClusterAliases map[cluster.ID]cluster.ID

	// pushVersion stores the numeric push version. This should be accessed via NextVersion()
	pushVersion atomic.Uint64

	// DiscoveryStartTime is the time since the binary started
	DiscoveryStartTime time.Time
}

                "path",
                "item_id"
            ],
            "msg": "value is not a valid integer",
            "type": "type_error.integer"
        }
    ]
}
```

eine Textversion:

```
1 validation error
path -> item_id
  value is not a valid integer (type=type_error.integer)
```

#### `RequestValidationError` vs. `ValidationError`

!!! warning "Achtung"

	// nolint: revive, stylecheck
	FmtOpenMetrics_1_0_0 = expfmt.OpenMetricsType + `; version=` + expfmt.OpenMetricsVersion_1_0_0 + `; charset=utf-8`
	FmtText              = `text/plain; version=` + expfmt.TextVersion + `; charset=utf-8`
)

func negotiateMetricsFormat(contentType string) expfmt.Format {
	mediaType, params, err := mime.ParseMediaType(contentType)
	if err == nil && mediaType == expfmt.OpenMetricsType {