Adding upstream version 1.34.4.

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

plugins/processors/defaults/defaults.go

@@ -0,0 +1,56 @@
+//go:generate ../../../tools/readme_config_includer/generator
+package defaults
+
+import (
+	_ "embed"
+	"strings"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/processors"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+// Defaults is a processor for ensuring certain fields always exist
+// on your Metrics with at least a default value.
+type Defaults struct {
+	DefaultFieldsSets map[string]interface{} `toml:"fields"`
+}
+
+func (*Defaults) SampleConfig() string {
+	return sampleConfig
+}
+
+// Apply contains the main implementation of this processor.
+// For each metric in 'inputMetrics', it goes over each default pair.
+// If the field in the pair does not exist on the metric, the associated default is added.
+// If the field was found, then, if its value is the empty string or one or more spaces, it is replaced
+// by the associated default.
+func (def *Defaults) Apply(inputMetrics ...telegraf.Metric) []telegraf.Metric {
+	for _, metric := range inputMetrics {
+		for defField, defValue := range def.DefaultFieldsSets {
+			if maybeCurrent, isSet := metric.GetField(defField); !isSet {
+				metric.AddField(defField, defValue)
+			} else if trimmed, isStr := maybeTrimmedString(maybeCurrent); isStr && trimmed == "" {
+				metric.RemoveField(defField)
+				metric.AddField(defField, defValue)
+			}
+		}
+	}
+	return inputMetrics
+}
+
+func maybeTrimmedString(v interface{}) (string, bool) {
+	if value, ok := v.(string); ok {
+		return strings.TrimSpace(value), true
+	}
+
+	return "", false
+}
+
+func init() {
+	processors.Add("defaults", func() telegraf.Processor {
+		return &Defaults{}
+	})
+}