Adding upstream version 1.34.4.

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

plugins/aggregators/valuecounter/valuecounter.go

@@ -0,0 +1,86 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package valuecounter
+
+import (
+	_ "embed"
+	"fmt"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/aggregators"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type aggregate struct {
+	name       string
+	tags       map[string]string
+	fieldCount map[string]int
+}
+
+// ValueCounter an aggregation plugin
+type ValueCounter struct {
+	cache  map[uint64]aggregate
+	Fields []string
+}
+
+// NewValueCounter create a new aggregation plugin which counts the occurrences
+// of fields and emits the count.
+func NewValueCounter() telegraf.Aggregator {
+	vc := &ValueCounter{}
+	vc.Reset()
+	return vc
+}
+
+func (*ValueCounter) SampleConfig() string {
+	return sampleConfig
+}
+
+// Add is run on every metric which passes the plugin
+func (vc *ValueCounter) Add(in telegraf.Metric) {
+	id := in.HashID()
+
+	// Check if the cache already has an entry for this metric, if not create it
+	if _, ok := vc.cache[id]; !ok {
+		a := aggregate{
+			name:       in.Name(),
+			tags:       in.Tags(),
+			fieldCount: make(map[string]int),
+		}
+		vc.cache[id] = a
+	}
+
+	// Check if this metric has fields which we need to count, if so increment
+	// the count.
+	for fk, fv := range in.Fields() {
+		for _, cf := range vc.Fields {
+			if fk == cf {
+				fn := fmt.Sprintf("%v_%v", fk, fv)
+				vc.cache[id].fieldCount[fn]++
+			}
+		}
+	}
+}
+
+// Push emits the counters
+func (vc *ValueCounter) Push(acc telegraf.Accumulator) {
+	for _, agg := range vc.cache {
+		fields := make(map[string]interface{}, len(agg.fieldCount))
+		for field, count := range agg.fieldCount {
+			fields[field] = count
+		}
+
+		acc.AddFields(agg.name, fields, agg.tags)
+	}
+}
+
+// Reset the cache, executed after each push
+func (vc *ValueCounter) Reset() {
+	vc.cache = make(map[uint64]aggregate)
+}
+
+func init() {
+	aggregators.Add("valuecounter", func() telegraf.Aggregator {
+		return NewValueCounter()
+	})
+}