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statscollector.go
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statscollector.go
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package prombolt
import (
"github.com/boltdb/bolt"
"github.com/prometheus/client_golang/prometheus"
)
var _ prometheus.Collector = &statsCollector{}
// A statsCollector is a prometheus.Collector for Bolt database and transaction
// statistics.
type statsCollector struct {
name string
ss statser
FreelistFreePages *prometheus.Desc
FreelistPendingPages *prometheus.Desc
FreelistFreePageAllocatedBytes *prometheus.Desc
FreelistInUseBytes *prometheus.Desc
ReadTxTotal *prometheus.Desc
OpenReadTx *prometheus.Desc
TxPagesAllocatedTotal *prometheus.Desc
TxPagesAllocatedBytesTotal *prometheus.Desc
TxCursorsTotal *prometheus.Desc
TxNodesAllocatedTotal *prometheus.Desc
TxNodesDereferencedTotal *prometheus.Desc
TxNodeRebalancesTotal *prometheus.Desc
TxNodeRebalanceSecondsTotal *prometheus.Desc
TxNodesSplitTotal *prometheus.Desc
TxNodesSpilledTotal *prometheus.Desc
TxNodesSpilledSecondsTotal *prometheus.Desc
TxWritesTotal *prometheus.Desc
TxWriteSecondsTotal *prometheus.Desc
}
var _ statser = &bolt.DB{}
// A statser is a type that can produce a bolt.Stats struct.
type statser interface {
Stats() bolt.Stats
}
// newStatsCollector creates a new statsCollector with the specified name and
// statser for retrieving statistics.
func newStatsCollector(name string, ss statser) *statsCollector {
const (
dbSubsystem = "db"
txSubsystem = "tx"
)
var (
labels = []string{"database"}
)
return &statsCollector{
name: name,
ss: ss,
FreelistFreePages: prometheus.NewDesc(
prometheus.BuildFQName(namespace, dbSubsystem, "freelist_free_pages"),
"Number of free pages on the freelist.",
labels,
nil,
),
FreelistPendingPages: prometheus.NewDesc(
prometheus.BuildFQName(namespace, dbSubsystem, "freelist_pending_pages"),
"Number of pending pages on the freelist.",
labels,
nil,
),
FreelistFreePageAllocatedBytes: prometheus.NewDesc(
prometheus.BuildFQName(namespace, dbSubsystem, "freelist_free_page_allocated_bytes"),
"Number of bytes allocated in free pages on the freelist.",
labels,
nil,
),
FreelistInUseBytes: prometheus.NewDesc(
prometheus.BuildFQName(namespace, dbSubsystem, "freelist_in_use_bytes"),
"Number of bytes in use by the freelist.",
labels,
nil,
),
ReadTxTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, dbSubsystem, "read_tx_total"),
"Total number of started read transactions for the database.",
labels,
nil,
),
OpenReadTx: prometheus.NewDesc(
prometheus.BuildFQName(namespace, dbSubsystem, "open_read_tx"),
"Number of currently open read-only transactions for the database.",
labels,
nil,
),
TxPagesAllocatedTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "pages_allocated_total"),
"Total number of transaction page allocations.",
labels,
nil,
),
TxPagesAllocatedBytesTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "pages_allocated_bytes_total"),
"Total number of bytes allocated for transaction pages.",
labels,
nil,
),
TxCursorsTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "cursors_total"),
"Total number of cursors created by transactions",
labels,
nil,
),
TxNodesAllocatedTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "nodes_allocated_total"),
"Total number of nodes allocated by transactions.",
labels,
nil,
),
TxNodesDereferencedTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "nodes_dereferenced_total"),
"Total number of nodes dereferenced by transactions.",
labels,
nil,
),
TxNodeRebalancesTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "node_rebalances_total"),
"Total number of node rebalances by transactions.",
labels,
nil,
),
TxNodeRebalanceSecondsTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "node_rebalance_seconds_total"),
"Total amount of time in seconds spent rebalancing nodes by transactions",
labels,
nil,
),
TxNodesSplitTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "nodes_split_total"),
"Total number of nodes split by transactions.",
labels,
nil,
),
TxNodesSpilledTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "nodes_spilled_total"),
"Total number of nodes spilled by transactions.",
labels,
nil,
),
TxNodesSpilledSecondsTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "nodes_spilled_seconds_total"),
"Total amount of time in seconds spent spilling nodes by transactions.",
labels,
nil,
),
TxWritesTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "writes_total"),
"Total number of writes to disk performed by transactions.",
labels,
nil,
),
TxWriteSecondsTotal: prometheus.NewDesc(
prometheus.BuildFQName(namespace, txSubsystem, "write_seconds_total"),
"Total amount of time in seconds spent writing to disk by transactions.",
labels,
nil,
),
}
}
var _ prometheus.Collector = &statsCollector{}
// Describe implements the prometheus.Collector interface.
func (c *statsCollector) Describe(ch chan<- *prometheus.Desc) {
ds := []*prometheus.Desc{
c.FreelistFreePages,
c.FreelistPendingPages,
c.FreelistFreePageAllocatedBytes,
c.FreelistInUseBytes,
c.ReadTxTotal,
c.OpenReadTx,
c.TxPagesAllocatedTotal,
c.TxPagesAllocatedBytesTotal,
c.TxCursorsTotal,
c.TxNodesAllocatedTotal,
c.TxNodesDereferencedTotal,
c.TxNodeRebalancesTotal,
c.TxNodeRebalanceSecondsTotal,
c.TxNodesSplitTotal,
c.TxNodesSpilledTotal,
c.TxNodesSpilledSecondsTotal,
c.TxWritesTotal,
c.TxWriteSecondsTotal,
}
for _, d := range ds {
ch <- d
}
}
// Collect implements the prometheus.Collector interface.
func (c *statsCollector) Collect(ch chan<- prometheus.Metric) {
s := c.ss.Stats()
ch <- prometheus.MustNewConstMetric(
c.FreelistFreePages,
prometheus.GaugeValue,
float64(s.FreePageN),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.FreelistPendingPages,
prometheus.GaugeValue,
float64(s.PendingPageN),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.FreelistFreePageAllocatedBytes,
prometheus.GaugeValue,
float64(s.FreeAlloc),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.FreelistInUseBytes,
prometheus.GaugeValue,
float64(s.FreelistInuse),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.ReadTxTotal,
prometheus.CounterValue,
float64(s.TxN),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.OpenReadTx,
prometheus.GaugeValue,
float64(s.OpenTxN),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxPagesAllocatedTotal,
prometheus.CounterValue,
float64(s.TxStats.PageCount),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxPagesAllocatedBytesTotal,
prometheus.CounterValue,
float64(s.TxStats.PageAlloc),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxCursorsTotal,
prometheus.CounterValue,
float64(s.TxStats.CursorCount),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodesAllocatedTotal,
prometheus.CounterValue,
float64(s.TxStats.NodeCount),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodesDereferencedTotal,
prometheus.CounterValue,
float64(s.TxStats.NodeDeref),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodeRebalancesTotal,
prometheus.CounterValue,
float64(s.TxStats.Rebalance),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodeRebalanceSecondsTotal,
prometheus.CounterValue,
s.TxStats.RebalanceTime.Seconds(),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodesSplitTotal,
prometheus.CounterValue,
float64(s.TxStats.Split),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodesSpilledTotal,
prometheus.CounterValue,
float64(s.TxStats.Spill),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxNodesSpilledSecondsTotal,
prometheus.CounterValue,
s.TxStats.SpillTime.Seconds(),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxWritesTotal,
prometheus.CounterValue,
float64(s.TxStats.Write),
c.name,
)
ch <- prometheus.MustNewConstMetric(
c.TxWriteSecondsTotal,
prometheus.CounterValue,
s.TxStats.WriteTime.Seconds(),
c.name,
)
}