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exporter.go
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exporter.go
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package groupcache_exporter
import (
"github.com/prometheus/client_golang/prometheus"
)
type Exporter struct {
groups []GroupStatistics
groupGets *prometheus.Desc
groupCacheHits *prometheus.Desc
groupPeerLoads *prometheus.Desc
groupPeerErrors *prometheus.Desc
groupLoads *prometheus.Desc
groupLoadsDeduped *prometheus.Desc
groupLocalLoads *prometheus.Desc
groupLocalLoadErrs *prometheus.Desc
groupServerRequests *prometheus.Desc
cacheBytes *prometheus.Desc
cacheItems *prometheus.Desc
cacheGets *prometheus.Desc
cacheHits *prometheus.Desc
cacheEvictions *prometheus.Desc
}
type GroupStatistics interface {
// Name returns the group's name
Name() string
// Gets represents any Get request, including from peers
Gets() int64
// CacheHits represents either cache was good
CacheHits() int64
// GetFromPeersLatencyLower represents slowest duration to request value from peers
GetFromPeersLatencyLower() int64
// PeerLoads represents either remote load or remote cache hit (not an error)
PeerLoads() int64
// PeerErrors represents a count of errors from peers
PeerErrors() int64
// Loads represents (gets - cacheHits)
Loads() int64
// LoadsDeduped represents after singleflight
LoadsDeduped() int64
// LocalLoads represents total good local loads
LocalLoads() int64
// LocalLoadErrs represents total bad local loads
LocalLoadErrs() int64
// ServerRequests represents gets that came over the network from peers
ServerRequests() int64
MainCacheItems() int64
MainCacheBytes() int64
MainCacheGets() int64
MainCacheHits() int64
MainCacheEvictions() int64
HotCacheItems() int64
HotCacheBytes() int64
HotCacheGets() int64
HotCacheHits() int64
HotCacheEvictions() int64
}
func NewExporter(labels map[string]string, groups ...GroupStatistics) *Exporter {
return &Exporter{
groups: groups,
groupGets: prometheus.NewDesc(
"gets_total",
"Counter of cache gets (including from peers)",
[]string{"group"},
labels,
),
groupCacheHits: prometheus.NewDesc(
"hits_total",
"Count of cache hits (from either main or hot cache)",
[]string{"group"},
labels,
),
groupPeerLoads: prometheus.NewDesc(
"peer_loads_total",
"Count of non-error loads or cache hits from peers",
[]string{"group"},
labels,
),
groupPeerErrors: prometheus.NewDesc(
"peer_errors_total",
"Count of errors from peers",
[]string{"group"},
labels,
),
groupLoads: prometheus.NewDesc(
"loads_total",
"Count of (gets - hits)",
[]string{"group"},
labels,
),
groupLoadsDeduped: prometheus.NewDesc(
"loads_deduped_total",
"Count of loads after singleflight",
[]string{"group"},
labels,
),
groupLocalLoads: prometheus.NewDesc(
"local_load_total",
"Count of loads from local cache",
[]string{"group"},
labels,
),
groupLocalLoadErrs: prometheus.NewDesc(
"local_load_errs_total",
"Count of loads from local cache that failed",
[]string{"group"},
labels,
),
groupServerRequests: prometheus.NewDesc(
"server_requests_total",
"Count of gets that came over the network from peers",
[]string{"group"},
labels,
),
cacheBytes: prometheus.NewDesc(
"cache_bytes",
"Gauge of current bytes in use",
[]string{"group", "type"},
labels,
),
cacheItems: prometheus.NewDesc(
"cache_items",
"Gauge of current items in use",
[]string{"group", "type"},
labels,
),
cacheGets: prometheus.NewDesc(
"cache_gets_total",
"Count of cache gets",
[]string{"group", "type"},
labels,
),
cacheHits: prometheus.NewDesc(
"cache_hits_total",
"Count of cache hits",
[]string{"group", "type"},
labels,
),
cacheEvictions: prometheus.NewDesc(
"cache_evictions_total",
"Count of cache evictions",
[]string{"group", "type"},
labels,
),
}
}
func (e *Exporter) Describe(ch chan<- *prometheus.Desc) {
ch <- e.groupGets
ch <- e.groupCacheHits
ch <- e.groupPeerLoads
ch <- e.groupPeerErrors
ch <- e.groupLoads
ch <- e.groupLoadsDeduped
ch <- e.groupLocalLoads
ch <- e.groupLocalLoadErrs
ch <- e.groupServerRequests
ch <- e.cacheBytes
ch <- e.cacheItems
ch <- e.cacheGets
ch <- e.cacheHits
ch <- e.cacheEvictions
}
func (e *Exporter) Collect(ch chan<- prometheus.Metric) {
for _, group := range e.groups {
e.collectFromGroup(ch, group)
}
}
func (e *Exporter) collectFromGroup(ch chan<- prometheus.Metric, stats GroupStatistics) {
e.collectStats(ch, stats)
e.collectCacheStats(ch, stats)
}
func (e *Exporter) collectStats(ch chan<- prometheus.Metric, stats GroupStatistics) {
ch <- prometheus.MustNewConstMetric(e.groupGets, prometheus.CounterValue, float64(stats.Gets()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupCacheHits, prometheus.CounterValue, float64(stats.CacheHits()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupPeerLoads, prometheus.CounterValue, float64(stats.PeerLoads()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupPeerErrors, prometheus.CounterValue, float64(stats.PeerErrors()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupLoads, prometheus.CounterValue, float64(stats.Loads()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupLoadsDeduped, prometheus.CounterValue, float64(stats.LoadsDeduped()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupLocalLoads, prometheus.CounterValue, float64(stats.LocalLoads()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupLocalLoadErrs, prometheus.CounterValue, float64(stats.LocalLoadErrs()), stats.Name())
ch <- prometheus.MustNewConstMetric(e.groupServerRequests, prometheus.CounterValue, float64(stats.ServerRequests()), stats.Name())
}
func (e *Exporter) collectCacheStats(ch chan<- prometheus.Metric, stats GroupStatistics) {
ch <- prometheus.MustNewConstMetric(e.cacheItems, prometheus.GaugeValue, float64(stats.MainCacheItems()), stats.Name(), "main")
ch <- prometheus.MustNewConstMetric(e.cacheBytes, prometheus.GaugeValue, float64(stats.MainCacheBytes()), stats.Name(), "main")
ch <- prometheus.MustNewConstMetric(e.cacheGets, prometheus.CounterValue, float64(stats.MainCacheGets()), stats.Name(), "main")
ch <- prometheus.MustNewConstMetric(e.cacheHits, prometheus.CounterValue, float64(stats.MainCacheHits()), stats.Name(), "main")
ch <- prometheus.MustNewConstMetric(e.cacheEvictions, prometheus.CounterValue, float64(stats.MainCacheEvictions()), stats.Name(), "main")
ch <- prometheus.MustNewConstMetric(e.cacheItems, prometheus.GaugeValue, float64(stats.HotCacheItems()), stats.Name(), "hot")
ch <- prometheus.MustNewConstMetric(e.cacheBytes, prometheus.GaugeValue, float64(stats.HotCacheBytes()), stats.Name(), "hot")
ch <- prometheus.MustNewConstMetric(e.cacheGets, prometheus.CounterValue, float64(stats.HotCacheGets()), stats.Name(), "hot")
ch <- prometheus.MustNewConstMetric(e.cacheHits, prometheus.CounterValue, float64(stats.HotCacheHits()), stats.Name(), "hot")
ch <- prometheus.MustNewConstMetric(e.cacheEvictions, prometheus.CounterValue, float64(stats.HotCacheEvictions()), stats.Name(), "hot")
}