Remove _info suffix.

metricbeat/helper/prometheus/prometheus_test.go

@@ -1242,7 +1242,7 @@ cc_seconds_created 123.456`
 	info :=
 		`# TYPE info_metric info
 # HELP info_metric help
-info_metric{foo="bar"} 1 2`
+info_metric_info{foo="bar"} 1 2`
 	infoMetricFamily := MetricFamily{
 		Name: stringp("info_metric"),
 		Help: stringp("help"),
@@ -1256,7 +1256,7 @@ info_metric{foo="bar"} 1 2`
 						Value: "bar",
 					},
 				},
-				Name: stringp("info_metric"),
+				Name: stringp("info_metric_info"),
 				Info: &Info{
 					Value: int64p(1),
 				},

metricbeat/helper/prometheus/textparse.go

@@ -325,6 +325,7 @@ const (
 	suffixSum     = "_sum"
 	suffixBucket  = "_bucket"
 	suffixCreated = "_created"
+	suffixInfo    = "_info"
 )
 
 // Counters have _total suffix
@@ -604,7 +605,8 @@ func ParseMetricFamilies(b []byte, contentType string, ts time.Time) ([]*MetricF
 			value := int64(v)
 			var info = &Info{Value: &value}
 			metric = &OpenMetric{Name: &metricName, Info: info, Label: labelPairs}
-			lookupMetricName = metricName
+			// remove the _info suffix
+			lookupMetricName = strings.TrimSuffix(metricName, suffixInfo)
 		case textparse.MetricTypeSummary:
 			lookupMetricName, metric = summaryMetricName(metricName, v, qv, lbls.String(), summariesByName)
 			metric.Label = labelPairs
@@ -654,7 +656,8 @@ func ParseMetricFamilies(b []byte, contentType string, ts time.Time) ([]*MetricF
 
 		fam, ok = metricFamiliesByName[lookupMetricName]
 		if !ok {
-			fam = &MetricFamily{Type: mt}
+			// If the family metric does not exist, create a new one with the lookup name
+			fam = &MetricFamily{Name: &lookupMetricName, Type: mt}
 			metricFamiliesByName[lookupMetricName] = fam
 		}