add golangci-lint linter (#5499)

plugin/test/scrape.go

@@ -80,7 +80,6 @@ func Scrape(url string) []*MetricFamily {
 // ScrapeMetricAsInt provides a sum of all metrics collected for the name and label provided.
 // if the metric is not a numeric value, it will be counted a 0.
 func ScrapeMetricAsInt(addr string, name string, label string, nometricvalue int) int {
-
 	valueToInt := func(m metric) int {
 		v := m.Value
 		r, err := strconv.Atoi(v)
@@ -141,7 +140,6 @@ func MetricValueLabel(name, label string, mfs []*MetricFamily) (string, map[stri
 						return m.(metric).Value, m.(metric).Labels
 					}
 				}
-
 			}
 		}
 	}