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watchtower/pkg/metrics/metrics.go

97 lines
2.6 KiB
Go

package metrics
import (
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/promauto"
)
var metrics *Metrics
// Metric is the data points of a single scan
type Metric struct {
Scanned int
Updated int
Failed int
}
// Metrics is the handler processing all individual scan metrics
type Metrics struct {
channel chan *Metric
scanned prometheus.Gauge
updated prometheus.Gauge
failed prometheus.Gauge
total prometheus.Counter
skipped prometheus.Counter
}
// QueueIsEmpty checks whether any messages are enqueued in the channel
func (metrics *Metrics) QueueIsEmpty() bool {
return len(metrics.channel) == 0
}
// Register registers metrics for an executed scan
func (metrics *Metrics) Register(metric *Metric) {
metrics.channel <- metric
}
// Default creates a new metrics handler if none exists, otherwise returns the existing one
func Default() *Metrics {
if metrics != nil {
return metrics
}
metrics = &Metrics{
scanned: promauto.NewGauge(prometheus.GaugeOpts{
Name: "watchtower_containers_scanned",
Help: "Number of containers scanned for changes by watchtower during the last scan",
}),
updated: promauto.NewGauge(prometheus.GaugeOpts{
Name: "watchtower_containers_updated",
Help: "Number of containers updated by watchtower during the last scan",
}),
failed: promauto.NewGauge(prometheus.GaugeOpts{
Name: "watchtower_containers_failed",
Help: "Number of containers where update failed during the last scan",
}),
total: promauto.NewCounter(prometheus.CounterOpts{
Name: "watchtower_scans_total",
Help: "Number of scans since the watchtower started",
}),
skipped: promauto.NewCounter(prometheus.CounterOpts{
Name: "watchtower_scans_skipped",
Help: "Number of skipped scans since watchtower started",
}),
channel: make(chan *Metric, 10),
}
go metrics.HandleUpdate(metrics.channel)
return metrics
}
// RegisterScan fetches a metric handler and enqueues a metric
func RegisterScan(metric *Metric) {
metrics := Default()
metrics.Register(metric)
}
// HandleUpdate dequeue the metric channel and processes it
func (metrics *Metrics) HandleUpdate(channel <-chan *Metric) {
for change := range channel {
if change == nil {
// Update was skipped and rescheduled
metrics.total.Inc()
metrics.skipped.Inc()
metrics.scanned.Set(0)
metrics.updated.Set(0)
metrics.failed.Set(0)
continue
}
// Update metrics with the new values
metrics.total.Inc()
metrics.scanned.Set(float64(change.Scanned))
metrics.updated.Set(float64(change.Updated))
metrics.failed.Set(float64(change.Failed))
}
}