Adding upstream version 1.34.4.

Signed-off-by: Daniel Baumann <daniel@debian.org>

plugins/processors/unpivot/unpivot.go

@@ -0,0 +1,82 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package unpivot
+
+import (
+	_ "embed"
+	"fmt"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/metric"
+	"github.com/influxdata/telegraf/plugins/processors"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type Unpivot struct {
+	FieldNameAs string `toml:"use_fieldname_as"`
+	TagKey      string `toml:"tag_key"`
+	ValueKey    string `toml:"value_key"`
+}
+
+func (*Unpivot) SampleConfig() string {
+	return sampleConfig
+}
+
+func (p *Unpivot) Init() error {
+	switch p.FieldNameAs {
+	case "", "tag":
+		p.FieldNameAs = "tag"
+	case "metric":
+	default:
+		return fmt.Errorf("unrecognized metric mode: %q", p.FieldNameAs)
+	}
+
+	if p.TagKey == "" {
+		p.TagKey = "name"
+	}
+	if p.ValueKey == "" {
+		p.ValueKey = "value"
+	}
+
+	return nil
+}
+
+func (p *Unpivot) Apply(metrics ...telegraf.Metric) []telegraf.Metric {
+	fieldCount := 0
+	for _, m := range metrics {
+		fieldCount += len(m.FieldList())
+	}
+	results := make([]telegraf.Metric, 0, fieldCount)
+
+	for _, src := range metrics {
+		// Create a copy without fields and tracking information
+		base := metric.New(src.Name(), make(map[string]string), make(map[string]interface{}), src.Time())
+		for _, t := range src.TagList() {
+			base.AddTag(t.Key, t.Value)
+		}
+
+		// Create a new metric per field and add it to the output
+		for _, field := range src.FieldList() {
+			m := base.Copy()
+			m.AddField(p.ValueKey, field.Value)
+
+			switch p.FieldNameAs {
+			case "metric":
+				m.SetName(field.Key)
+			case "tag":
+				m.AddTag(p.TagKey, field.Key)
+			}
+
+			results = append(results, m)
+		}
+		src.Accept()
+	}
+	return results
+}
+
+func init() {
+	processors.Add("unpivot", func() telegraf.Processor {
+		return &Unpivot{}
+	})
+}