Method Update

collector/bcachefs_linux.go:134–275

Update retrieves and exports bcachefs statistics.

(ch chan<- prometheus.Metric)

// Update retrieves and exports bcachefs statistics.
func (c *bcachefsCollector) Update(ch chan<- prometheus.Metric) error {
	stats, err := c.fs.Stats()
	if err != nil {
		if os.IsNotExist(err) {
			c.logger.Debug("bcachefs sysfs path does not exist", "path", sysFilePath("fs/bcachefs"))
			return ErrNoData
		}
		return fmt.Errorf("failed to retrieve bcachefs stats: %w", err)
	}

	if len(stats) == 0 {
		return ErrNoData
	}

	for _, s := range stats {
		uuid := s.UUID

		ch <- prometheus.MustNewConstMetric(
			bcachefsInfoDesc,
			prometheus.GaugeValue,
			1,
			uuid,
		)

		ch <- prometheus.MustNewConstMetric(
			bcachefsBtreeCacheSizeBytes,
			prometheus.GaugeValue,
			float64(s.BtreeCacheSizeBytes),
			uuid,
		)

		for algorithm, comp := range s.Compression {
			ch <- prometheus.MustNewConstMetric(
				bcachefsCompressionCompressedBytesDesc,
				prometheus.GaugeValue,
				float64(comp.CompressedBytes),
				uuid, algorithm,
			)
			ch <- prometheus.MustNewConstMetric(
				bcachefsCompressionUncompressedBytesDesc,
				prometheus.GaugeValue,
				float64(comp.UncompressedBytes),
				uuid, algorithm,
			)
		}

		for errorType, errStats := range s.Errors {
			ch <- prometheus.MustNewConstMetric(
				bcachefsErrorsTotalDesc,
				prometheus.CounterValue,
				float64(errStats.Count),
				uuid, errorType,
			)
		}

		for counterName, counterStats := range s.Counters {
			metricName := SanitizeMetricName(counterName) + "_total"
			ch <- prometheus.MustNewConstMetric(