add meta packet statistics (#230)

This change add more metrics around "meta" (non "message" type packets).
For lighthouse packets, we also record statistics around the specific
lighthouse meta type.

We don't keep statistics for the "message" type so that we don't slow
down the fast path (and you can just look at metrics on the tun
interface to find that information).

connection_manager_test.go

@@ -28,7 +28,7 @@ func Test_NewConnectionManagerTest(t *testing.T) {
 		rawCertificateNoKey: []byte{},
 	}
 
-	lh := NewLightHouse(false, 0, []uint32{}, 1000, 0, &udpConn{}, false, 1)
+	lh := NewLightHouse(false, 0, []uint32{}, 1000, 0, &udpConn{}, false, 1, false)
 	ifce := &Interface{
 		hostMap:          hostMap,
 		inside:           &Tun{},
@@ -91,7 +91,7 @@ func Test_NewConnectionManagerTest2(t *testing.T) {
 		rawCertificateNoKey: []byte{},
 	}
 
-	lh := NewLightHouse(false, 0, []uint32{}, 1000, 0, &udpConn{}, false, 1)
+	lh := NewLightHouse(false, 0, []uint32{}, 1000, 0, &udpConn{}, false, 1, false)
 	ifce := &Interface{
 		hostMap:          hostMap,
 		inside:           &Tun{},

examples/config.yml

@@ -177,6 +177,15 @@ logging:
   #subsystem: nebula
   #interval: 10s
 
+  # enables counter metrics for meta packets
+  #   e.g.: `messages.tx.handshake`
+  # NOTE: `message.{tx,rx}.recv_error` is always emitted
+  #message_metrics: false
+
+  # enables detailed counter metrics for lighthouse packets
+  #   e.g.: `lighthouse.rx.HostQuery`
+  #lighthouse_metrics: false
+
 # Handshake Manger Settings
 #handshakes:
   # Total time to try a handshake = sequence of `try_interval * retries`

handshake_ix.go

@@ -98,6 +98,7 @@ func ixHandshakeStage1(f *Interface, addr *udpAddr, hostinfo *HostInfo, packet [
 		hostinfo, _ := f.handshakeManager.pendingHostMap.QueryReverseIndex(hs.Details.InitiatorIndex)
 		if hostinfo != nil && bytes.Equal(hostinfo.HandshakePacket[0], packet[HeaderLen:]) {
 			if msg, ok := hostinfo.HandshakePacket[2]; ok {
+				f.messageMetrics.Tx(handshake, NebulaMessageSubType(msg[1]), 1)
 				err := f.outside.WriteTo(msg, addr)
 				if err != nil {
 					l.WithField("vpnIp", IntIp(hostinfo.hostId)).WithField("udpAddr", addr).
@@ -191,6 +192,7 @@ func ixHandshakeStage1(f *Interface, addr *udpAddr, hostinfo *HostInfo, packet [
 			hostinfo.HandshakePacket[2] = make([]byte, len(msg))
 			copy(hostinfo.HandshakePacket[2], msg)
 
+			f.messageMetrics.Tx(handshake, NebulaMessageSubType(msg[1]), 1)
 			err := f.outside.WriteTo(msg, addr)
 			if err != nil {
 				l.WithField("vpnIp", IntIp(vpnIP)).WithField("udpAddr", addr).

handshake_manager.go

@@ -31,6 +31,8 @@ type HandshakeConfig struct {
 	tryInterval  time.Duration
 	retries      int
 	waitRotation int
+
+	messageMetrics *MessageMetrics
 }
 
 type HandshakeManager struct {
@@ -42,6 +44,8 @@ type HandshakeManager struct {
 
 	OutboundHandshakeTimer *SystemTimerWheel
 	InboundHandshakeTimer  *SystemTimerWheel
+
+	messageMetrics *MessageMetrics
 }
 
 func NewHandshakeManager(tunCidr *net.IPNet, preferredRanges []*net.IPNet, mainHostMap *HostMap, lightHouse *LightHouse, outside *udpConn, config HandshakeConfig) *HandshakeManager {
@@ -55,6 +59,8 @@ func NewHandshakeManager(tunCidr *net.IPNet, preferredRanges []*net.IPNet, mainH
 
 		OutboundHandshakeTimer: NewSystemTimerWheel(config.tryInterval, config.tryInterval*time.Duration(config.retries)),
 		InboundHandshakeTimer:  NewSystemTimerWheel(config.tryInterval, config.tryInterval*time.Duration(config.retries)),
+
+		messageMetrics: config.messageMetrics,
 	}
 }
 
@@ -111,6 +117,7 @@ func (c *HandshakeManager) NextOutboundHandshakeTimerTick(now time.Time, f EncWr
 
 			// Ensure the handshake is ready to avoid a race in timer tick and stage 0 handshake generation
 			if hostinfo.HandshakeReady && hostinfo.remote != nil {
+				c.messageMetrics.Tx(handshake, NebulaMessageSubType(hostinfo.HandshakePacket[0][1]), 1)
 				err := c.outside.WriteTo(hostinfo.HandshakePacket[0], hostinfo.remote)
 				if err != nil {
 					hostinfo.logger().WithField("udpAddr", hostinfo.remote).

hostmap.go

@@ -30,6 +30,7 @@ type HostMap struct {
 	vpnCIDR         *net.IPNet
 	defaultRoute    uint32
 	unsafeRoutes    *CIDRTree
+	metricsEnabled  bool
 }
 
 type HostInfo struct {
@@ -384,8 +385,16 @@ func (hm *HostMap) PunchList() []*udpAddr {
 }
 
 func (hm *HostMap) Punchy(conn *udpConn) {
+	var metricsTxPunchy metrics.Counter
+	if hm.metricsEnabled {
+		metricsTxPunchy = metrics.GetOrRegisterCounter("messages.tx.punchy", nil)
+	} else {
+		metricsTxPunchy = metrics.NilCounter{}
+	}
+
 	for {
 		for _, addr := range hm.PunchList() {
+			metricsTxPunchy.Inc(1)
 			conn.WriteTo([]byte{1}, addr)
 		}
 		time.Sleep(time.Second * 30)

inside.go

@@ -46,7 +46,7 @@ func (f *Interface) consumeInsidePacket(packet []byte, fwPacket *FirewallPacket,
 
 	dropReason := f.firewall.Drop(packet, *fwPacket, false, hostinfo, trustedCAs)
 	if dropReason == nil {
-		f.send(message, 0, ci, hostinfo, hostinfo.remote, packet, nb, out)
+		f.sendNoMetrics(message, 0, ci, hostinfo, hostinfo.remote, packet, nb, out)
 		if f.lightHouse != nil && *ci.messageCounter%5000 == 0 {
 			f.lightHouse.Query(fwPacket.RemoteIP, f)
 		}
@@ -118,7 +118,7 @@ func (f *Interface) sendMessageNow(t NebulaMessageType, st NebulaMessageSubType,
 		return
 	}
 
-	f.send(message, st, hostInfo.ConnectionState, hostInfo, hostInfo.remote, p, nb, out)
+	f.sendNoMetrics(message, st, hostInfo.ConnectionState, hostInfo, hostInfo.remote, p, nb, out)
 	if f.lightHouse != nil && *hostInfo.ConnectionState.messageCounter%5000 == 0 {
 		f.lightHouse.Query(fp.RemoteIP, f)
 	}
@@ -175,6 +175,11 @@ func (f *Interface) sendMessageToAll(t NebulaMessageType, st NebulaMessageSubTyp
 }
 
 func (f *Interface) send(t NebulaMessageType, st NebulaMessageSubType, ci *ConnectionState, hostinfo *HostInfo, remote *udpAddr, p, nb, out []byte) {
+	f.messageMetrics.Tx(t, st, 1)
+	f.sendNoMetrics(t, st, ci, hostinfo, remote, p, nb, out)
+}
+
+func (f *Interface) sendNoMetrics(t NebulaMessageType, st NebulaMessageSubType, ci *ConnectionState, hostinfo *HostInfo, remote *udpAddr, p, nb, out []byte) {
 	if ci.eKey == nil {
 		//TODO: log warning
 		return

interface.go

@@ -25,6 +25,7 @@ type InterfaceConfig struct {
 	DropLocalBroadcast      bool
 	DropMulticast           bool
 	UDPBatchSize            int
+	MessageMetrics          *MessageMetrics
 }
 
 type Interface struct {
@@ -45,9 +46,8 @@ type Interface struct {
 	udpBatchSize       int
 	version            string
 
-	metricRxRecvError metrics.Counter
+	metricHandshakes metrics.Histogram
-	metricTxRecvError metrics.Counter
+	messageMetrics   *MessageMetrics
-	metricHandshakes  metrics.Histogram
 }
 
 func NewInterface(c *InterfaceConfig) (*Interface, error) {
@@ -80,9 +80,8 @@ func NewInterface(c *InterfaceConfig) (*Interface, error) {
 		dropMulticast:      c.DropMulticast,
 		udpBatchSize:       c.UDPBatchSize,
 
-		metricRxRecvError: metrics.GetOrRegisterCounter("messages.rx.recv_error", nil),
+		metricHandshakes: metrics.GetOrRegisterHistogram("handshakes", nil, metrics.NewExpDecaySample(1028, 0.015)),
-		metricTxRecvError: metrics.GetOrRegisterCounter("messages.tx.recv_error", nil),
+		messageMetrics:   c.MessageMetrics,
-		metricHandshakes:  metrics.GetOrRegisterHistogram("handshakes", nil, metrics.NewExpDecaySample(1028, 0.015)),
 	}
 
 	ifce.connectionManager = newConnectionManager(ifce, c.checkInterval, c.pendingDeletionInterval)

lighthouse.go

@@ -7,6 +7,7 @@ import (
 	"time"
 
 	"github.com/golang/protobuf/proto"
+	"github.com/rcrowley/go-metrics"
 	"github.com/slackhq/nebula/cert"
 )
 
@@ -37,6 +38,9 @@ type LightHouse struct {
 	nebulaPort  int
 	punchBack   bool
 	punchDelay  time.Duration
+
+	metrics           *MessageMetrics
+	metricHolepunchTx metrics.Counter
 }
 
 type EncWriter interface {
@@ -44,7 +48,7 @@ type EncWriter interface {
 	SendMessageToAll(t NebulaMessageType, st NebulaMessageSubType, vpnIp uint32, p, nb, out []byte)
 }
 
-func NewLightHouse(amLighthouse bool, myIp uint32, ips []uint32, interval int, nebulaPort int, pc *udpConn, punchBack bool, punchDelay time.Duration) *LightHouse {
+func NewLightHouse(amLighthouse bool, myIp uint32, ips []uint32, interval int, nebulaPort int, pc *udpConn, punchBack bool, punchDelay time.Duration, metricsEnabled bool) *LightHouse {
 	h := LightHouse{
 		amLighthouse: amLighthouse,
 		myIp:         myIp,
@@ -58,6 +62,14 @@ func NewLightHouse(amLighthouse bool, myIp uint32, ips []uint32, interval int, n
 		punchDelay:   punchDelay,
 	}
 
+	if metricsEnabled {
+		h.metrics = newLighthouseMetrics()
+
+		h.metricHolepunchTx = metrics.GetOrRegisterCounter("messages.tx.holepunch", nil)
+	} else {
+		h.metricHolepunchTx = metrics.NilCounter{}
+	}
+
 	for _, ip := range ips {
 		h.lighthouses[ip] = struct{}{}
 	}
@@ -111,6 +123,7 @@ func (lh *LightHouse) QueryServer(ip uint32, f EncWriter) {
 			return
 		}
 
+		lh.metricTx(NebulaMeta_HostQuery, int64(len(lh.lighthouses)))
 		nb := make([]byte, 12, 12)
 		out := make([]byte, mtu)
 		for n := range lh.lighthouses {
@@ -249,6 +262,7 @@ func (lh *LightHouse) LhUpdateWorker(f EncWriter) {
 			},
 		}
 
+		lh.metricTx(NebulaMeta_HostUpdateNotification, int64(len(lh.lighthouses)))
 		nb := make([]byte, 12, 12)
 		out := make([]byte, mtu)
 		for vpnIp := range lh.lighthouses {
@@ -281,6 +295,8 @@ func (lh *LightHouse) HandleRequest(rAddr *udpAddr, vpnIp uint32, p []byte, c *c
 		return
 	}
 
+	lh.metricRx(n.Type, 1)
+
 	switch n.Type {
 	case NebulaMeta_HostQuery:
 		// Exit if we don't answer queries
@@ -308,6 +324,7 @@ func (lh *LightHouse) HandleRequest(rAddr *udpAddr, vpnIp uint32, p []byte, c *c
 				l.WithError(err).WithField("vpnIp", IntIp(vpnIp)).Error("Failed to marshal lighthouse host query reply")
 				return
 			}
+			lh.metricTx(NebulaMeta_HostQueryReply, 1)
 			f.SendMessageToVpnIp(lightHouse, 0, vpnIp, reply, make([]byte, 12, 12), make([]byte, mtu))
 
 			// This signals the other side to punch some zero byte udp packets
@@ -326,6 +343,7 @@ func (lh *LightHouse) HandleRequest(rAddr *udpAddr, vpnIp uint32, p []byte, c *c
 					},
 				}
 				reply, _ := proto.Marshal(answer)
+				lh.metricTx(NebulaMeta_HostPunchNotification, 1)
 				f.SendMessageToVpnIp(lightHouse, 0, n.Details.VpnIp, reply, make([]byte, 12, 12), make([]byte, mtu))
 			}
 			//fmt.Println(reply, remoteaddr)
@@ -362,6 +380,7 @@ func (lh *LightHouse) HandleRequest(rAddr *udpAddr, vpnIp uint32, p []byte, c *c
 			vpnPeer := NewUDPAddr(a.Ip, uint16(a.Port))
 			go func() {
 				time.Sleep(lh.punchDelay)
+				lh.metricHolepunchTx.Inc(1)
 				lh.punchConn.WriteTo(empty, vpnPeer)
 
 			}()
@@ -380,6 +399,13 @@ func (lh *LightHouse) HandleRequest(rAddr *udpAddr, vpnIp uint32, p []byte, c *c
 	}
 }
 
+func (lh *LightHouse) metricRx(t NebulaMeta_MessageType, i int64) {
+	lh.metrics.Rx(NebulaMessageType(t), 0, i)
+}
+func (lh *LightHouse) metricTx(t NebulaMeta_MessageType, i int64) {
+	lh.metrics.Tx(NebulaMessageType(t), 0, i)
+}
+
 /*
 func (f *Interface) sendPathCheck(ci *ConnectionState, endpoint *net.UDPAddr, counter int) {
 	c := ci.messageCounter

lighthouse_test.go

@@ -52,7 +52,7 @@ func Test_lhStaticMapping(t *testing.T) {
 
 	udpServer, _ := NewListener("0.0.0.0", 0, true)
 
-	meh := NewLightHouse(true, 1, []uint32{ip2int(lh1IP)}, 10, 10003, udpServer, false, 1)
+	meh := NewLightHouse(true, 1, []uint32{ip2int(lh1IP)}, 10, 10003, udpServer, false, 1, false)
 	meh.AddRemote(ip2int(lh1IP), NewUDPAddr(ip2int(lh1IP), uint16(4242)), true)
 	err := meh.ValidateLHStaticEntries()
 	assert.Nil(t, err)
@@ -60,7 +60,7 @@ func Test_lhStaticMapping(t *testing.T) {
 	lh2 := "10.128.0.3"
 	lh2IP := net.ParseIP(lh2)
 
-	meh = NewLightHouse(true, 1, []uint32{ip2int(lh1IP), ip2int(lh2IP)}, 10, 10003, udpServer, false, 1)
+	meh = NewLightHouse(true, 1, []uint32{ip2int(lh1IP), ip2int(lh2IP)}, 10, 10003, udpServer, false, 1, false)
 	meh.AddRemote(ip2int(lh1IP), NewUDPAddr(ip2int(lh1IP), uint16(4242)), true)
 	err = meh.ValidateLHStaticEntries()
 	assert.EqualError(t, err, "Lighthouse 10.128.0.3 does not have a static_host_map entry")

main.go

@@ -172,6 +172,7 @@ func Main(configPath string, configTest bool, buildVersion string) {
 	hostMap := NewHostMap("main", tunCidr, preferredRanges)
 	hostMap.SetDefaultRoute(ip2int(net.ParseIP(config.GetString("default_route", "0.0.0.0"))))
 	hostMap.addUnsafeRoutes(&unsafeRoutes)
+	hostMap.metricsEnabled = config.GetBool("stats.message_metrics", false)
 
 	l.WithField("network", hostMap.vpnCIDR).WithField("preferredRanges", hostMap.preferredRanges).Info("Main HostMap created")
 
@@ -226,6 +227,7 @@ func Main(configPath string, configTest bool, buildVersion string) {
 		udpServer,
 		punchy.Respond,
 		punchy.Delay,
+		config.GetBool("stats.lighthouse_metrics", false),
 	)
 
 	remoteAllowList, err := config.GetAllowList("lighthouse.remote_allow_list", false)
@@ -280,10 +282,19 @@ func Main(configPath string, configTest bool, buildVersion string) {
 		l.WithError(err).Error("Lighthouse unreachable")
 	}
 
+	var messageMetrics *MessageMetrics
+	if config.GetBool("stats.message_metrics", false) {
+		messageMetrics = newMessageMetrics()
+	} else {
+		messageMetrics = newMessageMetricsOnlyRecvError()
+	}
+
 	handshakeConfig := HandshakeConfig{
 		tryInterval:  config.GetDuration("handshakes.try_interval", DefaultHandshakeTryInterval),
 		retries:      config.GetInt("handshakes.retries", DefaultHandshakeRetries),
 		waitRotation: config.GetInt("handshakes.wait_rotation", DefaultHandshakeWaitRotation),
+
+		messageMetrics: messageMetrics,
 	}
 
 	handshakeManager := NewHandshakeManager(tunCidr, preferredRanges, hostMap, lightHouse, udpServer, handshakeConfig)
@@ -310,6 +321,7 @@ func Main(configPath string, configTest bool, buildVersion string) {
 		DropLocalBroadcast:      config.GetBool("tun.drop_local_broadcast", false),
 		DropMulticast:           config.GetBool("tun.drop_multicast", false),
 		UDPBatchSize:            config.GetInt("listen.batch", 64),
+		MessageMetrics:          messageMetrics,
 	}
 
 	switch ifConfig.Cipher {

message_metrics.go

@@ -0,0 +1,97 @@
+package nebula
+
+import (
+	"fmt"
+
+	"github.com/rcrowley/go-metrics"
+)
+
+type MessageMetrics struct {
+	rx [][]metrics.Counter
+	tx [][]metrics.Counter
+
+	rxUnknown metrics.Counter
+	txUnknown metrics.Counter
+}
+
+func (m *MessageMetrics) Rx(t NebulaMessageType, s NebulaMessageSubType, i int64) {
+	if m != nil {
+		if t >= 0 && int(t) < len(m.rx) && s >= 0 && int(s) < len(m.rx[t]) {
+			m.rx[t][s].Inc(i)
+		} else if m.rxUnknown != nil {
+			m.rxUnknown.Inc(i)
+		}
+	}
+}
+func (m *MessageMetrics) Tx(t NebulaMessageType, s NebulaMessageSubType, i int64) {
+	if m != nil {
+		if t >= 0 && int(t) < len(m.tx) && s >= 0 && int(s) < len(m.tx[t]) {
+			m.tx[t][s].Inc(i)
+		} else if m.txUnknown != nil {
+			m.txUnknown.Inc(i)
+		}
+	}
+}
+
+func newMessageMetrics() *MessageMetrics {
+	gen := func(t string) [][]metrics.Counter {
+		return [][]metrics.Counter{
+			{
+				metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.handshake_ixpsk0", t), nil),
+			},
+			nil,
+			{metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.recv_error", t), nil)},
+			{metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.lighthouse", t), nil)},
+			{
+				metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.test_request", t), nil),
+				metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.test_response", t), nil),
+			},
+			{metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.close_tunnel", t), nil)},
+		}
+	}
+	return &MessageMetrics{
+		rx: gen("rx"),
+		tx: gen("tx"),
+
+		rxUnknown: metrics.GetOrRegisterCounter("messages.rx.other", nil),
+		txUnknown: metrics.GetOrRegisterCounter("messages.tx.other", nil),
+	}
+}
+
+// Historically we only recorded recv_error, so this is backwards compat
+func newMessageMetricsOnlyRecvError() *MessageMetrics {
+	gen := func(t string) [][]metrics.Counter {
+		return [][]metrics.Counter{
+			nil,
+			nil,
+			{metrics.GetOrRegisterCounter(fmt.Sprintf("messages.%s.recv_error", t), nil)},
+		}
+	}
+	return &MessageMetrics{
+		rx: gen("rx"),
+		tx: gen("tx"),
+	}
+}
+
+func newLighthouseMetrics() *MessageMetrics {
+	gen := func(t string) [][]metrics.Counter {
+		h := make([][]metrics.Counter, len(NebulaMeta_MessageType_name))
+		used := []NebulaMeta_MessageType{
+			NebulaMeta_HostQuery,
+			NebulaMeta_HostQueryReply,
+			NebulaMeta_HostUpdateNotification,
+			NebulaMeta_HostPunchNotification,
+		}
+		for _, i := range used {
+			h[i] = []metrics.Counter{metrics.GetOrRegisterCounter(fmt.Sprintf("lighthouse.%s.%s", t, i.String()), nil)}
+		}
+		return h
+	}
+	return &MessageMetrics{
+		rx: gen("rx"),
+		tx: gen("tx"),
+
+		rxUnknown: metrics.GetOrRegisterCounter("lighthouse.rx.other", nil),
+		txUnknown: metrics.GetOrRegisterCounter("lighthouse.tx.other", nil),
+	}
+}

outside.go

@@ -54,6 +54,7 @@ func (f *Interface) readOutsidePackets(addr *udpAddr, out []byte, packet []byte,
 		// Fallthrough to the bottom to record incoming traffic
 
 	case lightHouse:
+		f.messageMetrics.Rx(header.Type, header.Subtype, 1)
 		if !f.handleEncrypted(ci, addr, header) {
 			return
 		}
@@ -74,6 +75,7 @@ func (f *Interface) readOutsidePackets(addr *udpAddr, out []byte, packet []byte,
 		// Fallthrough to the bottom to record incoming traffic
 
 	case test:
+		f.messageMetrics.Rx(header.Type, header.Subtype, 1)
 		if !f.handleEncrypted(ci, addr, header) {
 			return
 		}
@@ -102,15 +104,18 @@ func (f *Interface) readOutsidePackets(addr *udpAddr, out []byte, packet []byte,
 		// are unauthenticated
 
 	case handshake:
+		f.messageMetrics.Rx(header.Type, header.Subtype, 1)
 		HandleIncomingHandshake(f, addr, packet, header, hostinfo)
 		return
 
 	case recvError:
+		f.messageMetrics.Rx(header.Type, header.Subtype, 1)
 		// TODO: Remove this with recv_error deprecation
 		f.handleRecvError(addr, header)
 		return
 
 	case closeTunnel:
+		f.messageMetrics.Rx(header.Type, header.Subtype, 1)
 		if !f.handleEncrypted(ci, addr, header) {
 			return
 		}
@@ -122,6 +127,7 @@ func (f *Interface) readOutsidePackets(addr *udpAddr, out []byte, packet []byte,
 		return
 
 	default:
+		f.messageMetrics.Rx(header.Type, header.Subtype, 1)
 		hostinfo.logger().Debugf("Unexpected packet received from %s", addr)
 		return
 	}
@@ -298,7 +304,7 @@ func (f *Interface) decryptToTun(hostinfo *HostInfo, messageCounter uint64, out
 }
 
 func (f *Interface) sendRecvError(endpoint *udpAddr, index uint32) {
-	f.metricTxRecvError.Inc(1)
+	f.messageMetrics.Tx(recvError, 0, 1)
 
 	//TODO: this should be a signed message so we can trust that we should drop the index
 	b := HeaderEncode(make([]byte, HeaderLen), Version, uint8(recvError), 0, index, 0)
@@ -311,8 +317,6 @@ func (f *Interface) sendRecvError(endpoint *udpAddr, index uint32) {
 }
 
 func (f *Interface) handleRecvError(addr *udpAddr, h *Header) {
-	f.metricRxRecvError.Inc(1)
-
 	// This flag is to stop caring about recv_error from old versions
 	// This should go away when the old version is gone from prod
 	if l.Level >= logrus.DebugLevel {