Adding upstream version 1.34.4.

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

plugins/inputs/trig/README.md

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+# Trig Input Plugin
+
+The `trig` plugin is for demonstration purposes and inserts sine and cosine
+
+## Global configuration options <!-- @/docs/includes/plugin_config.md -->
+
+In addition to the plugin-specific configuration settings, plugins support
+additional global and plugin configuration settings. These settings are used to
+modify metrics, tags, and field or create aliases and configure ordering, etc.
+See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
+
+[CONFIGURATION.md]: ../../../docs/CONFIGURATION.md#plugins
+
+## Configuration
+
+```toml @sample.conf
+# Inserts sine and cosine waves for demonstration purposes
+[[inputs.trig]]
+  ## Set the amplitude
+  amplitude = 10.0
+```
+
+## Metrics
+
+- trig
+  - fields:
+    - cosine (float)
+    - sine (float)
+
+## Example Output
+
+```text
+trig,host=MBP15-SWANG.local cosine=10,sine=0 1632338680000000000
+trig,host=MBP15-SWANG.local sine=5.877852522924732,cosine=8.090169943749473 1632338690000000000
+trig,host=MBP15-SWANG.local sine=9.510565162951535,cosine=3.0901699437494745 1632338700000000000
+```

plugins/inputs/trig/sample.conf

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+# Inserts sine and cosine waves for demonstration purposes
+[[inputs.trig]]
+  ## Set the amplitude
+  amplitude = 10.0

plugins/inputs/trig/trig.go

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+//go:generate ../../../tools/readme_config_includer/generator
+package trig
+
+import (
+	_ "embed"
+	"math"
+
+	"github.com/influxdata/telegraf"
+	"github.com/influxdata/telegraf/plugins/inputs"
+)
+
+//go:embed sample.conf
+var sampleConfig string
+
+type Trig struct {
+	Amplitude float64 `toml:"amplitude"`
+	x         float64
+}
+
+func (*Trig) SampleConfig() string {
+	return sampleConfig
+}
+
+func (s *Trig) Gather(acc telegraf.Accumulator) error {
+	sinner := math.Sin((s.x*math.Pi)/5.0) * s.Amplitude
+	cosinner := math.Cos((s.x*math.Pi)/5.0) * s.Amplitude
+
+	fields := make(map[string]interface{})
+	fields["sine"] = sinner
+	fields["cosine"] = cosinner
+
+	tags := make(map[string]string)
+
+	s.x += 1.0
+	acc.AddFields("trig", fields, tags)
+
+	return nil
+}
+
+func init() {
+	inputs.Add("trig", func() telegraf.Input { return &Trig{x: 0.0} })
+}

plugins/inputs/trig/trig_test.go

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+package trig
+
+import (
+	"math"
+	"testing"
+
+	"github.com/stretchr/testify/require"
+
+	"github.com/influxdata/telegraf/testutil"
+)
+
+func TestTrig(t *testing.T) {
+	s := &Trig{
+		Amplitude: 10.0,
+	}
+
+	for i := 0.0; i < 10.0; i++ {
+		var acc testutil.Accumulator
+
+		sine := math.Sin((i*math.Pi)/5.0) * s.Amplitude
+		cosine := math.Cos((i*math.Pi)/5.0) * s.Amplitude
+
+		require.NoError(t, s.Gather(&acc))
+
+		fields := make(map[string]interface{})
+		fields["sine"] = sine
+		fields["cosine"] = cosine
+
+		acc.AssertContainsFields(t, "trig", fields)
+	}
+}