set SO_LINGER=0 to tcp connection

prober/http.go

@@ -353,14 +353,27 @@ func ProbeHTTP(ctx context.Context, target string, module config.Module, registr
 			}
 		}
 	}
-	client, err := pconfig.NewClientFromConfig(httpClientConfig, "http_probe", pconfig.WithKeepAlivesDisabled())
+	dialWithLinger := func(ctx context.Context, network, addr string) (net.Conn, error) {
+		d := &net.Dialer{}
+		conn, err := d.DialContext(ctx, network, addr)
+		if err != nil {
+			return nil, err
+		}
+		tcpConn, ok := conn.(*net.TCPConn)
+		if ok {
+			tcpConn.SetLinger(0)
+			return tcpConn, nil
+		}
+		return conn, nil
+	}
+	client, err := pconfig.NewClientFromConfig(httpClientConfig, "http_probe", pconfig.WithKeepAlivesDisabled(), pconfig.WithDialContextFunc(dialWithLinger))
 	if err != nil {
 		level.Error(logger).Log("msg", "Error generating HTTP client", "err", err)
 		return false
 	}
 
 	httpClientConfig.TLSConfig.ServerName = ""
-	noServerName, err := pconfig.NewRoundTripperFromConfig(httpClientConfig, "http_probe", pconfig.WithKeepAlivesDisabled())
+	noServerName, err := pconfig.NewRoundTripperFromConfig(httpClientConfig, "http_probe", pconfig.WithKeepAlivesDisabled(), pconfig.WithDialContextFunc(dialWithLinger))
 	if err != nil {
 		level.Error(logger).Log("msg", "Error generating HTTP client without ServerName", "err", err)
 		return false

prober/tcp.go

@@ -114,6 +114,9 @@ func ProbeTCP(ctx context.Context, target string, module config.Module, registry
 		level.Error(logger).Log("msg", "Error dialing TCP", "err", err)
 		return false
 	}
+	if tcpConn, ok := conn.(*net.TCPConn); ok {
+		tcpConn.SetLinger(0)
+	}
 	defer conn.Close()
 	level.Info(logger).Log("msg", "Successfully dialed")