feat(inputs.statsd): Allow reporting sets and timings count as floats (#15853)

plugins/inputs/statsd/README.md

@@ -127,6 +127,13 @@ See the [CONFIGURATION.md][CONFIGURATION.md] for more details.
   ## Enabling this would ensure that both counters and guages are both emitted
   ## as floats.
   # float_counters = false
+
+  ## Emit timings `metric_<name>_count` field as float, the same as all other
+  ## histogram fields
+  # float_timings = false
+
+  ## Emit sets as float
+  # float_sets = false
 ```
 
 ## Description

plugins/inputs/statsd/sample.conf

@@ -100,3 +100,10 @@
   ## Enabling this would ensure that both counters and guages are both emitted
   ## as floats.
   # float_counters = false
+
+  ## Emit timings `metric_<name>_count` field as float, the same as all other
+  ## histogram fields
+  # float_timings = false
+
+  ## Emit sets as float
+  # float_sets = false

plugins/inputs/statsd/statsd.go

@@ -77,6 +77,8 @@ type Statsd struct {
 	DeleteTimings   bool     `toml:"delete_timings"`
 	ConvertNames    bool     `toml:"convert_names"`
 	FloatCounters   bool     `toml:"float_counters"`
+	FloatTimings    bool     `toml:"float_timings"`
+	FloatSets       bool     `toml:"float_sets"`
 
 	EnableAggregationTemporality bool `toml:"enable_aggregation_temporality"`
 
@@ -260,7 +262,11 @@ func (s *Statsd) Gather(acc telegraf.Accumulator) error {
 			fields[prefix+"sum"] = stats.Sum()
 			fields[prefix+"upper"] = stats.Upper()
 			fields[prefix+"lower"] = stats.Lower()
-			fields[prefix+"count"] = stats.Count()
+			if s.FloatTimings {
+				fields[prefix+"count"] = float64(stats.Count())
+			} else {
+				fields[prefix+"count"] = stats.Count()
+			}
 			for _, percentile := range s.Percentiles {
 				name := fmt.Sprintf("%s%v_percentile", prefix, percentile)
 				fields[name] = stats.Percentile(float64(percentile))
@@ -306,7 +312,11 @@ func (s *Statsd) Gather(acc telegraf.Accumulator) error {
 	for _, m := range s.sets {
 		fields := make(map[string]interface{})
 		for field, set := range m.fields {
-			fields[field] = int64(len(set))
+			if s.FloatSets {
+				fields[field] = float64(len(set))
+			} else {
+				fields[field] = int64(len(set))
+			}
 		}
 		if s.EnableAggregationTemporality {
 			fields["start_time"] = s.lastGatherTime.Format(time.RFC3339)

plugins/inputs/statsd/statsd_test.go

@@ -473,6 +473,51 @@ func TestParse_Sets(t *testing.T) {
 	}
 }
 
+func TestParse_Sets_SetsAsFloat(t *testing.T) {
+	s := NewTestStatsd()
+	s.FloatSets = true
+
+	// Test that sets work
+	validLines := []string{
+		"unique.user.ids:100|s",
+		"unique.user.ids:100|s",
+		"unique.user.ids:200|s",
+	}
+
+	for _, line := range validLines {
+		require.NoErrorf(t, s.parseStatsdLine(line), "Parsing line %s should not have resulted in an error", line)
+	}
+
+	validations := []struct {
+		name  string
+		value int64
+	}{
+		{
+			"unique_user_ids",
+			2,
+		},
+	}
+	for _, test := range validations {
+		require.NoError(t, testValidateSet(test.name, test.value, s.sets))
+	}
+
+	expected := []telegraf.Metric{
+		testutil.MustMetric(
+			"unique_user_ids",
+			map[string]string{"metric_type": "set"},
+			map[string]interface{}{"value": 2.0},
+			time.Now(),
+			telegraf.Untyped,
+		),
+	}
+
+	acc := &testutil.Accumulator{}
+	require.NoError(t, s.Gather(acc))
+	metrics := acc.GetTelegrafMetrics()
+	testutil.PrintMetrics(metrics)
+	testutil.RequireMetricsEqual(t, expected, metrics, testutil.IgnoreTime(), testutil.SortMetrics())
+}
+
 // Tests low-level functionality of counters
 func TestParse_Counters(t *testing.T) {
 	s := NewTestStatsd()
@@ -676,6 +721,37 @@ func TestParse_Timings(t *testing.T) {
 	acc.AssertContainsFields(t, "test_timing", valid)
 }
 
+func TestParse_Timings_TimingsAsFloat(t *testing.T) {
+	s := NewTestStatsd()
+	s.FloatTimings = true
+	s.Percentiles = []Number{90.0}
+	acc := &testutil.Accumulator{}
+
+	// Test that timings work
+	validLines := []string{
+		"test.timing:100|ms",
+	}
+
+	for _, line := range validLines {
+		require.NoErrorf(t, s.parseStatsdLine(line), "Parsing line %s should not have resulted in an error", line)
+	}
+
+	require.NoError(t, s.Gather(acc))
+
+	valid := map[string]interface{}{
+		"90_percentile": float64(100),
+		"count":         float64(1),
+		"lower":         float64(100),
+		"mean":          float64(100),
+		"median":        float64(100),
+		"stddev":        float64(0),
+		"sum":           float64(100),
+		"upper":         float64(100),
+	}
+
+	acc.AssertContainsFields(t, "test_timing", valid)
+}
+
 // Tests low-level functionality of distributions
 func TestParse_Distributions(t *testing.T) {
 	s := NewTestStatsd()