mirror of
https://github.com/kubernetes/node-problem-detector.git
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101 lines
2.8 KiB
Go
101 lines
2.8 KiB
Go
/*
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Copyright 2019 The Kubernetes Authors All rights reserved.
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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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"context"
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"fmt"
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"go.opencensus.io/stats"
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"go.opencensus.io/stats/view"
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"go.opencensus.io/tag"
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)
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// Float64MetricRepresentation represents a snapshot of a float64 metrics.
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// This is used for inspecting metric internals.
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type Float64MetricRepresentation struct {
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// Name is the metric name.
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Name string
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// Labels contains all metric labels in key-value pair format.
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Labels map[string]string
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// Value is the value of the metric.
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Value float64
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}
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// Float64Metric represents an float64 metric.
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type Float64Metric struct {
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name string
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measure *stats.Float64Measure
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}
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// NewFloat64Metric create a Float64Metric metrics, returns nil when viewName is empty.
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func NewFloat64Metric(metricID MetricID, viewName string, description string, unit string, aggregation Aggregation, tagNames []string) (*Float64Metric, error) {
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if viewName == "" {
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return nil, nil
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}
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MetricMap.AddMapping(metricID, viewName)
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tagKeys, err := getTagKeysFromNames(tagNames)
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if err != nil {
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return nil, fmt.Errorf("failed to create metric %q because of tag creation failure: %v", viewName, err)
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}
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var aggregationMethod *view.Aggregation
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switch aggregation {
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case LastValue:
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aggregationMethod = view.LastValue()
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case Sum:
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aggregationMethod = view.Sum()
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default:
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return nil, fmt.Errorf("unknown aggregation option %q", aggregation)
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}
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measure := stats.Float64(viewName, description, unit)
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newView := &view.View{
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Name: viewName,
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Measure: measure,
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Description: description,
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Aggregation: aggregationMethod,
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TagKeys: tagKeys,
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}
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view.Register(newView)
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metric := Float64Metric{viewName, measure}
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return &metric, nil
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}
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// Record records a measurement for the metric, with provided tags as metric labels.
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func (metric *Float64Metric) Record(tags map[string]string, measurement float64) error {
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var mutators []tag.Mutator
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tagMapMutex.RLock()
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defer tagMapMutex.RUnlock()
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for tagName, tagValue := range tags {
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tagKey, ok := tagMap[tagName]
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if !ok {
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return fmt.Errorf("referencing none existing tag %q in metric %q", tagName, metric.name)
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}
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mutators = append(mutators, tag.Upsert(tagKey, tagValue))
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}
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return stats.RecordWithTags(
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context.Background(),
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mutators,
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metric.measure.M(measurement))
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}
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