79 lines
2.8 KiB
Go
79 lines
2.8 KiB
Go
/*
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Copyright 2021 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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"sync"
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compbasemetrics "k8s.io/component-base/metrics"
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"k8s.io/component-base/metrics/legacyregistry"
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)
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/*
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* By default, all the following metrics are defined as falling under
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* ALPHA stability level https://github.com/kubernetes/enhancements/blob/master/keps/sig-instrumentation/1209-metrics-stability/kubernetes-control-plane-metrics-stability.md#stability-classes)
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*
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* Promoting the stability level of the metric is a responsibility of the component owner, since it
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* involves explicitly acknowledging support for the metric across multiple releases, in accordance with
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* the metric stability policy.
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*/
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var (
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listCacheCount = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Name: "apiserver_cache_list_total",
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Help: "Number of LIST requests served from watch cache",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"resource_prefix", "index"},
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)
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listCacheNumFetched = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Name: "apiserver_cache_list_fetched_objects_total",
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Help: "Number of objects read from watch cache in the course of serving a LIST request",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"resource_prefix", "index"},
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)
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listCacheNumReturned = compbasemetrics.NewCounterVec(
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&compbasemetrics.CounterOpts{
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Name: "apiserver_cache_list_returned_objects_total",
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Help: "Number of objects returned for a LIST request from watch cache",
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StabilityLevel: compbasemetrics.ALPHA,
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},
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[]string{"resource_prefix"},
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)
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)
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var registerMetrics sync.Once
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// Register all metrics.
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func Register() {
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// Register the metrics.
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registerMetrics.Do(func() {
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legacyregistry.MustRegister(listCacheCount)
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legacyregistry.MustRegister(listCacheNumFetched)
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legacyregistry.MustRegister(listCacheNumReturned)
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})
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}
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// RecordListCacheMetrics notes various metrics of the cost to serve a LIST request
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func RecordListCacheMetrics(resourcePrefix, indexName string, numFetched, numReturned int) {
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listCacheCount.WithLabelValues(resourcePrefix, indexName).Inc()
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listCacheNumFetched.WithLabelValues(resourcePrefix, indexName).Add(float64(numFetched))
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listCacheNumReturned.WithLabelValues(resourcePrefix).Add(float64(numReturned))
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}
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