Method updateBcacheStats

collector/bcache_linux.go:154–366

UpdateBcacheStats collects statistics for one bcache ID.

(ch chan<- prometheus.Metric, s *bcache.Stats)

// UpdateBcacheStats collects statistics for one bcache ID.
func (c *bcacheCollector) updateBcacheStats(ch chan<- prometheus.Metric, s *bcache.Stats) {

	const (
		subsystem = "bcache"
	)

	var (
		devLabel   = []string{"uuid"}
		allMetrics []bcacheMetric
		metrics    []bcacheMetric
	)

	allMetrics = []bcacheMetric{
		// metrics in /sys/fs/bcache/<uuid>/
		{
			name:       "average_key_size_sectors",
			desc:       "Average data per key in the btree (sectors).",
			value:      float64(s.Bcache.AverageKeySize),
			metricType: prometheus.GaugeValue,
		},
		{
			name:       "btree_cache_size_bytes",
			desc:       "Amount of memory currently used by the btree cache.",
			value:      float64(s.Bcache.BtreeCacheSize),
			metricType: prometheus.GaugeValue,
		},
		{
			name:       "cache_available_percent",
			desc:       "Percentage of cache device without dirty data, usable for writeback (may contain clean cached data).",
			value:      float64(s.Bcache.CacheAvailablePercent),
			metricType: prometheus.GaugeValue,
		},
		{
			name:       "congested",
			desc:       "Congestion.",
			value:      float64(s.Bcache.Congested),
			metricType: prometheus.GaugeValue,
		},
		{
			name:       "root_usage_percent",
			desc:       "Percentage of the root btree node in use (tree depth increases if too high).",
			value:      float64(s.Bcache.RootUsagePercent),
			metricType: prometheus.GaugeValue,
		},
		{
			name:       "tree_depth",
			desc:       "Depth of the btree.",
			value:      float64(s.Bcache.TreeDepth),
			metricType: prometheus.GaugeValue,
		},
		// metrics in /sys/fs/bcache/<uuid>/internal/
		{
			name:       "active_journal_entries",
			desc:       "Number of journal entries that are newer than the index.",
			value:      float64(s.Bcache.Internal.ActiveJournalEntries),
			metricType: prometheus.GaugeValue,
		},
		{