72 lines
1.4 KiB
Go
72 lines
1.4 KiB
Go
package unpivot
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import (
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"github.com/influxdata/telegraf"
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"github.com/influxdata/telegraf/plugins/processors"
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)
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const (
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description = "Rotate multi field metric into several single field metrics"
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sampleConfig = `
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## Tag to use for the name.
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tag_key = "name"
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## Field to use for the name of the value.
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value_key = "value"
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`
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)
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type Unpivot struct {
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TagKey string `toml:"tag_key"`
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ValueKey string `toml:"value_key"`
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}
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func (p *Unpivot) SampleConfig() string {
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return sampleConfig
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}
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func (p *Unpivot) Description() string {
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return description
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}
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func copyWithoutFields(metric telegraf.Metric) telegraf.Metric {
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m := metric.Copy()
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fieldKeys := make([]string, 0, len(m.FieldList()))
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for _, field := range m.FieldList() {
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fieldKeys = append(fieldKeys, field.Key)
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}
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for _, fk := range fieldKeys {
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m.RemoveField(fk)
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}
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return m
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}
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func (p *Unpivot) Apply(metrics ...telegraf.Metric) []telegraf.Metric {
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fieldCount := 0
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for _, m := range metrics {
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fieldCount += len(m.FieldList())
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}
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results := make([]telegraf.Metric, 0, fieldCount)
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for _, m := range metrics {
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base := copyWithoutFields(m)
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for _, field := range m.FieldList() {
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newMetric := base.Copy()
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newMetric.AddField(p.ValueKey, field.Value)
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newMetric.AddTag(p.TagKey, field.Key)
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results = append(results, newMetric)
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}
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m.Accept()
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}
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return results
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}
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func init() {
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processors.Add("unpivot", func() telegraf.Processor {
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return &Unpivot{}
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})
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}
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