latencyBuckets: defaultLatencyBuckets,
		latency:        make([]atomic.Uint64, len(defaultLatencyBuckets)),
		conn: &StubKMS{
			KeyNames: []string{defaultKeyName},
		},
	}
}

// StubKMS is a KMS implementation for tests
type StubKMS struct {
	KeyNames []string
}

// Version returns the type of the KMS.
func (s StubKMS) Version(ctx context.Context) (string, error) {
	return "stub", nil
}

	}
	return metadata
}

// cleanMetadataKeys takes keyNames to be filtered
// and returns a new map with all the entries with keyNames removed.
func cleanMetadataKeys(metadata map[string]string, keyNames ...string) map[string]string {
	newMeta := make(map[string]string, len(metadata))
	for k, v := range metadata {
		if slices.Contains(keyNames, k) {
			continue
		}
		newMeta[k] = v
	}
	return newMeta
}