net/netmon: publish events to event bus

Updates #15160

Signed-off-by: David Anderson <dave@tailscale.com>

cmd/tailscale/cli/debug.go

@@ -43,6 +43,7 @@ import (
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/key"
 	"tailscale.com/types/logger"
+	"tailscale.com/util/eventbus"
 	"tailscale.com/util/must"
 )
 
@@ -956,7 +957,10 @@ func runTS2021(ctx context.Context, args []string) error {
 		logf = log.Printf
 	}
 
-	netMon, err := netmon.New(logger.WithPrefix(logf, "netmon: "))
+	bus := eventbus.New()
+	defer bus.Close()
+
+	netMon, err := netmon.New(bus, logger.WithPrefix(logf, "netmon: "))
 	if err != nil {
 		return fmt.Errorf("creating netmon: %w", err)
 	}

cmd/tailscale/cli/netcheck.go

@@ -24,6 +24,7 @@ import (
 	"tailscale.com/net/tlsdial"
 	"tailscale.com/tailcfg"
 	"tailscale.com/types/logger"
+	"tailscale.com/util/eventbus"
 )
 
 var netcheckCmd = &ffcli.Command{
@@ -48,7 +49,9 @@ var netcheckArgs struct {
 
 func runNetcheck(ctx context.Context, args []string) error {
 	logf := logger.WithPrefix(log.Printf, "portmap: ")
-	netMon, err := netmon.New(logf)
+	bus := eventbus.New()
+	defer bus.Close()
+	netMon, err := netmon.New(bus, logf)
 	if err != nil {
 		return err
 	}