mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-11-30 18:20:19 +00:00
77 lines
2.4 KiB
Go
77 lines
2.4 KiB
Go
/*
|
|
Copyright 2015 The Kubernetes Authors.
|
|
|
|
Licensed under the Apache License, Version 2.0 (the "License");
|
|
you may not use this file except in compliance with the License.
|
|
You may obtain a copy of the License at
|
|
|
|
http://www.apache.org/licenses/LICENSE-2.0
|
|
|
|
Unless required by applicable law or agreed to in writing, software
|
|
distributed under the License is distributed on an "AS IS" BASIS,
|
|
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
|
|
See the License for the specific language governing permissions and
|
|
limitations under the License.
|
|
*/
|
|
|
|
package metrics
|
|
|
|
import (
|
|
"fmt"
|
|
"sync"
|
|
|
|
"k8s.io/client-go/util/flowcontrol"
|
|
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
)
|
|
|
|
var (
|
|
metricsLock sync.Mutex
|
|
rateLimiterMetrics = make(map[string]*rateLimiterMetric)
|
|
)
|
|
|
|
type rateLimiterMetric struct {
|
|
metric prometheus.Gauge
|
|
stopCh chan struct{}
|
|
}
|
|
|
|
func registerRateLimiterMetric(ownerName string) error {
|
|
metricsLock.Lock()
|
|
defer metricsLock.Unlock()
|
|
|
|
if _, ok := rateLimiterMetrics[ownerName]; ok {
|
|
// only register once in Prometheus. We happen to see an ownerName reused in parallel integration tests.
|
|
return nil
|
|
}
|
|
metric := prometheus.NewGauge(prometheus.GaugeOpts{
|
|
Name: "rate_limiter_use",
|
|
Subsystem: ownerName,
|
|
Help: fmt.Sprintf("A metric measuring the saturation of the rate limiter for %v", ownerName),
|
|
})
|
|
if err := prometheus.Register(metric); err != nil {
|
|
return fmt.Errorf("error registering rate limiter usage metric: %v", err)
|
|
}
|
|
stopCh := make(chan struct{})
|
|
rateLimiterMetrics[ownerName] = &rateLimiterMetric{
|
|
metric: metric,
|
|
stopCh: stopCh,
|
|
}
|
|
return nil
|
|
}
|
|
|
|
// RegisterMetricAndTrackRateLimiterUsage registers a metric ownerName_rate_limiter_use in prometheus to track
|
|
// how much used rateLimiter is and starts a goroutine that updates this metric every updatePeriod
|
|
func RegisterMetricAndTrackRateLimiterUsage(ownerName string, rateLimiter flowcontrol.RateLimiter) error {
|
|
if err := registerRateLimiterMetric(ownerName); err != nil {
|
|
return err
|
|
}
|
|
// TODO: determine how to track rate limiter saturation
|
|
// See discussion at https://go-review.googlesource.com/c/time/+/29958#message-4caffc11669cadd90e2da4c05122cfec50ea6a22
|
|
// go wait.Until(func() {
|
|
// metricsLock.Lock()
|
|
// defer metricsLock.Unlock()
|
|
// rateLimiterMetrics[ownerName].metric.Set()
|
|
// }, updatePeriod, rateLimiterMetrics[ownerName].stopCh)
|
|
return nil
|
|
}
|