frostfs-observability/metrics/registry.go
Dmitrii Stepanov 3c1b76ee51 [] metrics: Move from node
Signed-off-by: Dmitrii Stepanov <d.stepanov@yadro.com>
2023-05-31 11:27:42 +03:00

44 lines
1.3 KiB
Go

package metrics
import (
"net/http"
"sync"
"github.com/prometheus/client_golang/prometheus"
"github.com/prometheus/client_golang/prometheus/collectors"
"github.com/prometheus/client_golang/prometheus/promhttp"
)
var (
registry = prometheus.NewRegistry()
// registeredDescriptionsMtx protects collectors slice.
// It should not be acessed concurrently, but we can easily forget this in future, thus this mutex.
registeredDescriptionsMtx sync.Mutex
registeredDescriptions []Description
)
func init() {
registry.MustRegister(collectors.NewProcessCollector(collectors.ProcessCollectorOpts{}))
registry.MustRegister(collectors.NewGoCollector())
}
// Register registers custom collectors to registry.
// Should be used with metrics from other packages.
func Register(customCollectors ...prometheus.Collector) {
registry.MustRegister(customCollectors...)
}
func mustRegister(c prometheus.Collector, desc Description) {
registry.MustRegister(c)
registeredDescriptionsMtx.Lock()
defer registeredDescriptionsMtx.Unlock()
registeredDescriptions = append(registeredDescriptions, desc)
}
// Handler returns an http.Handler for the local registry.
func Handler() http.Handler {
promhttp.Handler()
return promhttp.InstrumentMetricHandler(
registry,
promhttp.HandlerFor(registry, promhttp.HandlerOpts{}))
}