validate number of influx line segments

same validation logic used by the sensu go agent for metric extraction

Signed-off-by: Sean Porter <portertech@gmail.com>

sensu-prometheus-collector.go

@@ -9,6 +9,7 @@ import (
 	"net/http"
 	"os"
 	"strconv"
+	"strings"
 	"time"
 
 	"github.com/kelseyhightower/envconfig"
@@ -100,7 +101,10 @@ func CreateInfluxMetrics(samples model.Vector, metricPrefix string) string {
 
 		metric += fmt.Sprintf(" value=%s %d\n", value, timestamp)
 
-		metrics += metric
+		segments := strings.Split(metric, " ")
+		if len(segments) == 3 {
+			metrics += metric
+		}
 	}
 
 	return metrics