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77 lines
2.4 KiB
77 lines
2.4 KiB
5 years ago
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/*
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Copyright 2019 The Kubernetes Authors.
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Licensed under the Apache License, Version 2.0 (the "License");
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you may not use this file except in compliance with the License.
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You may obtain a copy of the License at
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http://www.apache.org/licenses/LICENSE-2.0
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Unless required by applicable law or agreed to in writing, software
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distributed under the License is distributed on an "AS IS" BASIS,
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WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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See the License for the specific language governing permissions and
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limitations under the License.
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*/
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package metrics
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import (
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"github.com/prometheus/client_golang/prometheus"
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dto "github.com/prometheus/client_model/go"
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)
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// This file contains a series of interfaces which we explicitly define for
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// integrating with prometheus. We redefine the interfaces explicitly here
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// so that we can prevent breakage if methods are ever added to prometheus
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// variants of them.
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// Collector defines a subset of prometheus.Collector interface methods
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type Collector interface {
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Describe(chan<- *prometheus.Desc)
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Collect(chan<- prometheus.Metric)
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}
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// Metric defines a subset of prometheus.Metric interface methods
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type Metric interface {
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Desc() *prometheus.Desc
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Write(*dto.Metric) error
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}
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// CounterMetric is a Metric that represents a single numerical value that only ever
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// goes up. That implies that it cannot be used to count items whose number can
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// also go down, e.g. the number of currently running goroutines. Those
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// "counters" are represented by Gauges.
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// CounterMetric is an interface which defines a subset of the interface provided by prometheus.Counter
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type CounterMetric interface {
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Inc()
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Add(float64)
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}
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// CounterVecMetric is an interface which prometheus.CounterVec satisfies.
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type CounterVecMetric interface {
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WithLabelValues(...string) CounterMetric
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With(prometheus.Labels) CounterMetric
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}
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// GaugeMetric is an interface which defines a subset of the interface provided by prometheus.Gauge
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type GaugeMetric interface {
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Set(float64)
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}
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// ObserverMetric captures individual observations.
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type ObserverMetric interface {
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Observe(float64)
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}
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// PromRegistry is an interface which implements a subset of prometheus.Registerer and
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// prometheus.Gatherer interfaces
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type PromRegistry interface {
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Register(prometheus.Collector) error
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MustRegister(...prometheus.Collector)
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Unregister(prometheus.Collector) bool
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Gather() ([]*dto.MetricFamily, error)
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}
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