Refactor collectors

Signed-off-by: Jan-Otto Kröpke <mail@jkroepke.de>

pkg/collector/net/net_bench_test.go

@@ -0,0 +1,19 @@
+//go:build windows
+
+package net_test
+
+import (
+	"testing"
+
+	"github.com/alecthomas/kingpin/v2"
+	"github.com/prometheus-community/windows_exporter/pkg/collector/net"
+	"github.com/prometheus-community/windows_exporter/pkg/testutils"
+)
+
+func BenchmarkCollector(b *testing.B) {
+	// Include is not set in testing context (kingpin flags not parsed), causing the collector to skip all interfaces.
+	localNicInclude := ".+"
+
+	kingpin.CommandLine.GetArg(net.FlagNicInclude).StringVar(&localNicInclude)
+	testutils.FuncBenchmarkCollector(b, net.Name, net.NewWithFlags)
+}