simplify benchmarks

filter/metrics_parser_bench_test.go

@@ -7,7 +7,7 @@ import (
 )
 
 var (
-	metric = "test.name;testTag1=test1test1;testTag2=test2test2test2;testTag3=test3test4test5;testTag4=test6test7test8test9"
+	metric = "test.metric;test1=test1test1;test2=test2test2test2;test3=test3test3test3test3;test4=test4test4test4test4test4;test5=test5test5test5test5;test6=test6test6test6;test7=test7test7;test8=test8"
 	name   = "test.metric"
 
 	labels = map[string]string{
@@ -23,13 +23,6 @@ var (
 )
 
 func BenchmarkRestoreMetricStringByNameAndLabels(b *testing.B) {
-	metric := name
-	for key, value := range labels {
-		metric += ";" + key + "=" + value
-	}
-
-	b.ResetTimer()
-
 	for i := 0; i < b.N; i++ {
 		_ = restoreMetricStringByNameAndLabels(name, labels, len(metric))
 	}