Converge to typed value in prometheus output (#3104)

This commit is contained in:
Daniel Nelson 2017-08-10 10:19:28 -07:00 committed by GitHub
parent b1eb240b18
commit 294b7322b4
2 changed files with 61 additions and 1 deletions

View File

@ -254,7 +254,17 @@ func (p *PrometheusClient) Write(metrics []telegraf.Metric) error {
} }
p.fam[mname] = fam p.fam[mname] = fam
} else { } else {
if fam.ValueType != vt { // Metrics can be untyped even though the corresponding plugin
// creates them with a type. This happens when the metric was
// transferred over the network in a format that does not
// preserve value type and received using an input such as a
// queue consumer. To avoid issues we automatically upgrade
// value type from untyped to a typed metric.
if fam.ValueType == prometheus.UntypedValue {
fam.ValueType = vt
}
if vt != prometheus.UntypedValue && fam.ValueType != vt {
// Don't return an error since this would be a permanent error // Don't return an error since this would be a permanent error
log.Printf("Mixed ValueType for measurement %q; dropping point", point.Name()) log.Printf("Mixed ValueType for measurement %q; dropping point", point.Name())
break break

View File

@ -189,6 +189,56 @@ func TestWrite_MixedValueType(t *testing.T) {
require.Equal(t, 1, len(fam.Samples)) require.Equal(t, 1, len(fam.Samples))
} }
func TestWrite_MixedValueTypeUpgrade(t *testing.T) {
now := time.Now()
p1, err := metric.New(
"foo",
map[string]string{"a": "x"},
map[string]interface{}{"value": 1.0},
now,
telegraf.Untyped)
p2, err := metric.New(
"foo",
map[string]string{"a": "y"},
map[string]interface{}{"value": 2.0},
now,
telegraf.Gauge)
var metrics = []telegraf.Metric{p1, p2}
client := NewClient()
err = client.Write(metrics)
require.NoError(t, err)
fam, ok := client.fam["foo"]
require.True(t, ok)
require.Equal(t, 2, len(fam.Samples))
}
func TestWrite_MixedValueTypeDowngrade(t *testing.T) {
now := time.Now()
p1, err := metric.New(
"foo",
map[string]string{"a": "x"},
map[string]interface{}{"value": 1.0},
now,
telegraf.Gauge)
p2, err := metric.New(
"foo",
map[string]string{"a": "y"},
map[string]interface{}{"value": 2.0},
now,
telegraf.Untyped)
var metrics = []telegraf.Metric{p1, p2}
client := NewClient()
err = client.Write(metrics)
require.NoError(t, err)
fam, ok := client.fam["foo"]
require.True(t, ok)
require.Equal(t, 2, len(fam.Samples))
}
func TestWrite_Tags(t *testing.T) { func TestWrite_Tags(t *testing.T) {
now := time.Now() now := time.Now()
p1, err := metric.New( p1, err := metric.New(