mirror of
https://github.com/ceph/ceph-csi.git
synced 2024-12-23 05:20:19 +00:00
96 lines
2.9 KiB
Go
96 lines
2.9 KiB
Go
/*
|
|
Copyright 2019 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 (
|
|
"github.com/prometheus/client_golang/prometheus"
|
|
dto "github.com/prometheus/client_model/go"
|
|
)
|
|
|
|
// This file contains a series of interfaces which we explicitly define for
|
|
// integrating with prometheus. We redefine the interfaces explicitly here
|
|
// so that we can prevent breakage if methods are ever added to prometheus
|
|
// variants of them.
|
|
|
|
// Collector defines a subset of prometheus.Collector interface methods
|
|
type Collector interface {
|
|
Describe(chan<- *prometheus.Desc)
|
|
Collect(chan<- prometheus.Metric)
|
|
}
|
|
|
|
// Metric defines a subset of prometheus.Metric interface methods
|
|
type Metric interface {
|
|
Desc() *prometheus.Desc
|
|
Write(*dto.Metric) error
|
|
}
|
|
|
|
// CounterMetric is a Metric that represents a single numerical value that only ever
|
|
// goes up. That implies that it cannot be used to count items whose number can
|
|
// also go down, e.g. the number of currently running goroutines. Those
|
|
// "counters" are represented by Gauges.
|
|
|
|
// CounterMetric is an interface which defines a subset of the interface provided by prometheus.Counter
|
|
type CounterMetric interface {
|
|
Inc()
|
|
Add(float64)
|
|
}
|
|
|
|
// CounterVecMetric is an interface which prometheus.CounterVec satisfies.
|
|
type CounterVecMetric interface {
|
|
WithLabelValues(...string) CounterMetric
|
|
With(prometheus.Labels) CounterMetric
|
|
}
|
|
|
|
// GaugeMetric is an interface which defines a subset of the interface provided by prometheus.Gauge
|
|
type GaugeMetric interface {
|
|
Set(float64)
|
|
Inc()
|
|
Dec()
|
|
Add(float64)
|
|
Write(out *dto.Metric) error
|
|
SetToCurrentTime()
|
|
}
|
|
|
|
// ObserverMetric captures individual observations.
|
|
type ObserverMetric interface {
|
|
Observe(float64)
|
|
}
|
|
|
|
// PromRegistry is an interface which implements a subset of prometheus.Registerer and
|
|
// prometheus.Gatherer interfaces
|
|
type PromRegistry interface {
|
|
Register(prometheus.Collector) error
|
|
MustRegister(...prometheus.Collector)
|
|
Unregister(prometheus.Collector) bool
|
|
Gather() ([]*dto.MetricFamily, error)
|
|
}
|
|
|
|
// Gatherer is the interface for the part of a registry in charge of gathering
|
|
// the collected metrics into a number of MetricFamilies.
|
|
type Gatherer interface {
|
|
prometheus.Gatherer
|
|
}
|
|
|
|
// GaugeFunc is a Gauge whose value is determined at collect time by calling a
|
|
// provided function.
|
|
//
|
|
// To create GaugeFunc instances, use NewGaugeFunc.
|
|
type GaugeFunc interface {
|
|
Metric
|
|
Collector
|
|
}
|