Adding upstream version 1.34.4.

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

plugins/parsers/prometheusremotewrite/parser.go

@@ -0,0 +1,72 @@
+package prometheusremotewrite
+
+import (
+	"errors"
+	"fmt"
+
+	"github.com/prometheus/prometheus/prompb"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/parsers"
+)
+
+type Parser struct {
+	MetricVersion int `toml:"prometheus_metric_version"`
+	DefaultTags   map[string]string
+}
+
+func (p *Parser) Parse(buf []byte) ([]telegraf.Metric, error) {
+	var err error
+	var metrics []telegraf.Metric
+	var req prompb.WriteRequest
+
+	if err := req.Unmarshal(buf); err != nil {
+		return nil, fmt.Errorf("unable to unmarshal request body: %w", err)
+	}
+
+	for _, ts := range req.Timeseries {
+		var metricsFromTS []telegraf.Metric
+		switch p.MetricVersion {
+		case 0, 2:
+			metricsFromTS, err = p.extractMetricsV2(&ts)
+		case 1:
+			metricsFromTS, err = p.extractMetricsV1(&ts)
+		default:
+			return nil, fmt.Errorf("unknown prometheus metric version %d", p.MetricVersion)
+		}
+		if err != nil {
+			return nil, err
+		}
+		metrics = append(metrics, metricsFromTS...)
+	}
+
+	return metrics, err
+}
+
+func (p *Parser) ParseLine(line string) (telegraf.Metric, error) {
+	metrics, err := p.Parse([]byte(line))
+	if err != nil {
+		return nil, err
+	}
+
+	if len(metrics) < 1 {
+		return nil, errors.New("no metrics in line")
+	}
+
+	if len(metrics) > 1 {
+		return nil, errors.New("more than one metric in line")
+	}
+
+	return metrics[0], nil
+}
+
+func (p *Parser) SetDefaultTags(tags map[string]string) {
+	p.DefaultTags = tags
+}
+
+func init() {
+	parsers.Add("prometheusremotewrite",
+		func(string) telegraf.Parser {
+			return &Parser{}
+		})
+}