feat(rtt): 'machine rtt' command to show round-trip time between macines usign using gossip data (#226)

* Add corrosion admin client function to get RTT to other machines in the cluster

* Add `uc machine rtt` showing all pair-wise RTT stats from corrosion

* Add long description to machine rtt command

* Include machine peer RTTs in InspectMachine instead of adding new gRPC API for it

* Add nil check on InspectMachine's Rtt field to protect from a potential edge case

* Generate docs for machine rtt command

* Handle m.Message being nil when a node is down or unavailble

* Update cli-docs

* Use tui Table instead of tabwriter

* Change reported RTT to the median rather than mean. Still calculate include stddev, as it might be a useful indication of network jitter.

* Show RTT to peers in `wg show` output

* Update cli docs

cmd/uncloud/machine/root.go

@@ -16,6 +16,7 @@ func NewRootCommand() *cobra.Command {
 		NewListCommand(),
 		NewRenameCommand(),
 		NewRmCommand(),
+		NewRTTCommand(),
 		NewUpdateCommand(),
 	)
 	return cmd

cmd/uncloud/machine/rtt.go

@@ -0,0 +1,106 @@
+package machine
+
+import (
+	"context"
+	"fmt"
+	"math"
+	"sort"
+
+	"github.com/psviderski/uncloud/internal/cli"
+	"github.com/psviderski/uncloud/internal/cli/tui"
+	"github.com/spf13/cobra"
+	"google.golang.org/protobuf/types/known/emptypb"
+)
+
+func NewRTTCommand() *cobra.Command {
+	cmd := &cobra.Command{
+		Use:   "rtt",
+		Short: "Show round-trip times between machines.",
+		Long: `Show round-trip times between machines.
+
+Round-trip time statistics are collected from the Corrosion gossip protocol
+and represent the median of recent RTT samples between each pair of machines
+in the cluster. The values shown include the median RTT and standard deviation
+for each machine-to-machine connection.`,
+		RunE: func(cmd *cobra.Command, args []string) error {
+			uncli := cmd.Context().Value("cli").(*cli.CLI)
+			return rtt(cmd.Context(), uncli)
+		},
+	}
+	return cmd
+}
+
+func rtt(ctx context.Context, uncli *cli.CLI) error {
+	client, err := uncli.ConnectCluster(ctx)
+	if err != nil {
+		return fmt.Errorf("connect to cluster: %w", err)
+	}
+	defer client.Close()
+
+	// Setup context to proxy request to all machines.
+	ctx, _, err = client.ProxyMachinesContext(ctx, nil)
+	if err != nil {
+		return fmt.Errorf("setup proxy context: %w", err)
+	}
+
+	resp, err := client.MachineClient.InspectMachine(ctx, &emptypb.Empty{})
+	if err != nil {
+		return fmt.Errorf("inspect machines: %w", err)
+	}
+
+	// Map machine IDs to names for display from the response.
+	machineNames := make(map[string]string)
+	for _, m := range resp.Machines {
+		if m.Machine == nil {
+			continue
+		}
+		machineNames[m.Machine.Id] = m.Machine.Name
+	}
+
+	type row struct {
+		machine string
+		peer    string
+		median  float64
+		stdDev  float64
+	}
+	var rows []row
+
+	for _, m := range resp.Machines {
+		// Unlikely to occur, but might be a possible edge case when
+		// a machine is still initializing. So just to be safe..
+		if m.Machine == nil || m.Rtts == nil {
+			continue
+		}
+		for peerID, stats := range m.Rtts {
+			peerName := peerID
+			if name, ok := machineNames[peerID]; ok {
+				peerName = name
+			}
+			rows = append(rows, row{
+				machine: m.Machine.Name,
+				peer:    peerName,
+				median:  stats.Median,
+				stdDev:  stats.StdDev,
+			})
+		}
+	}
+
+	// Sort by machine name then peer name
+	sort.Slice(rows, func(i, j int) bool {
+		if rows[i].machine == rows[j].machine {
+			return rows[i].peer < rows[j].peer
+		}
+		return rows[i].machine < rows[j].machine
+	})
+
+	// Print table
+	t := tui.NewTable()
+	t.Headers("MACHINE", "PEER", "MEDIAN", "STDDEV")
+
+	for _, r := range rows {
+		t.Row(r.machine, r.peer, fmt.Sprintf("%dms", int64(math.Ceil(r.median))), fmt.Sprintf("±%.1fms", r.stdDev))
+	}
+
+	fmt.Println(t)
+	return nil
+}

cmd/uncloud/wg/wg.go

@@ -3,12 +3,14 @@ package wg
 import (
 	"context"
 	"fmt"
+	"math"
 	"strings"
 	"time"
 
 	"github.com/docker/go-units"
 	"github.com/psviderski/uncloud/internal/cli"
 	"github.com/psviderski/uncloud/internal/cli/tui"
+	"github.com/psviderski/uncloud/internal/machine/api/pb"
 	"github.com/spf13/cobra"
 	"golang.zx2c4.com/wireguard/wgctrl/wgtypes"
 	"google.golang.org/grpc/codes"
@@ -74,16 +76,18 @@ func runShow(ctx context.Context, uncli *cli.CLI, opts showOptions) error {
 	if err != nil {
 		return fmt.Errorf("list machines: %w", err)
 	}
-	machinesNamesByPublicKey := make(map[string]string)
+	machinesByPublicKey := make(map[string]*pb.MachineInfo)
 	for _, m := range machines {
 		publicKey := wgtypes.Key(m.Machine.Network.PublicKey).String()
-		machinesNamesByPublicKey[publicKey] = m.Machine.Name
+		machinesByPublicKey[publicKey] = m.Machine
 	}
 
-	// Fetch the machine's name for more descriptive output
+	// Fetch the machine's info and RTTs for display
+	var selfMachine *pb.MachineDetails
 	inspectResp, err := client.MachineClient.InspectMachine(ctx, nil)
 	if err == nil {
-		fmt.Printf("Machine name:         %s\n", inspectResp.Machines[0].Machine.Name)
+		selfMachine = inspectResp.Machines[0]
+		fmt.Printf("Machine name:         %s\n", selfMachine.Machine.Name)
 	}
 
 	fmt.Printf("WireGuard interface:  %s\n", resp.InterfaceName)
@@ -97,12 +101,19 @@ func runShow(ctx context.Context, uncli *cli.CLI, opts showOptions) error {
 	}
 
 	t := tui.NewTable()
-	t.Headers("PEER", "PUBLIC KEY", "ENDPOINT", "HANDSHAKE", "RECEIVED", "SENT", "ALLOWED IPS")
+	t.Headers("PEER", "PUBLIC KEY", "ENDPOINT", "HANDSHAKE", "RTT", "RECEIVED", "SENT", "ALLOWED IPS")
 
 	for _, peer := range resp.Peers {
-		machineName, ok := machinesNamesByPublicKey[wgtypes.Key(peer.PublicKey).String()]
+		publicKeyStr := wgtypes.Key(peer.PublicKey).String()
-		if !ok {
+		machineName := "(unknown)"
-			machineName = "(unknown)"
+		rtt := "-"
+		if m, ok := machinesByPublicKey[publicKeyStr]; ok {
+			machineName = m.Name
+			if selfMachine != nil {
+				if stats, ok := selfMachine.Rtts[m.Id]; ok {
+					rtt = fmt.Sprintf("%dms", int64(math.Ceil(stats.Median)))
+				}
+			}
 		}
 
 		lastHandshake := ""
@@ -112,9 +123,10 @@ func runShow(ctx context.Context, uncli *cli.CLI, opts showOptions) error {
 
 		t.Row(
 			machineName,
-			wgtypes.Key(peer.PublicKey).String(),
+			publicKeyStr,
 			peer.Endpoint,
 			lastHandshake,
+			rtt,
 			units.HumanSize(float64(peer.ReceiveBytes)),
 			units.HumanSize(float64(peer.TransmitBytes)),
 			strings.Join(peer.AllowedIps, tui.Faint.Render(", ")),

internal/corrosion/admin.go

@@ -6,8 +6,10 @@ import (
 	"errors"
 	"fmt"
 	"io"
+	"math"
 	"net"
 	"net/netip"
+	"sort"
 	"time"
 )
 
@@ -256,3 +258,106 @@ func (c *AdminClient) ClusterMembershipStates(latest bool) ([]ClusterMembershipS
 	}
 	return states, parseErr
 }
+
+type MemberRTTStats struct {
+	Addr   netip.AddrPort
+	Median float64
+	StdDev float64
+}
+
+// ClusterMemberRTTs returns the median and standard deviation of round-trip times to each cluster member.
+func (c *AdminClient) ClusterMemberRTTs() ([]MemberRTTStats, error) {
+	respCh, err := c.SendCommand([]byte("{\"Cluster\":\"Members\"}"))
+	if err != nil {
+		return nil, err
+	}
+
+	var stats []MemberRTTStats
+	var parseErr error
+
+	for r := range respCh {
+		if r.Err != nil {
+			return nil, r.Err
+		}
+
+		addr, rtts, err := parseClusterMemberRTT(r.JSON)
+		if err != nil {
+			parseErr = errors.Join(parseErr, err)
+			continue
+		}
+
+		if len(rtts) == 0 {
+			continue
+		}
+
+		sort.Float64s(rtts)
+		n := len(rtts)
+		var median float64
+		if n%2 == 0 {
+			median = (rtts[n/2-1] + rtts[n/2]) / 2
+		} else {
+			median = rtts[n/2]
+		}
+
+		var sum float64
+		for _, rtt := range rtts {
+			sum += rtt
+		}
+		avg := sum / float64(n)
+
+		var varianceSum float64
+		for _, rtt := range rtts {
+			diff := rtt - avg
+			varianceSum += diff * diff
+		}
+		stdDev := math.Sqrt(varianceSum / float64(n))
+
+		stats = append(stats, MemberRTTStats{
+			Addr:   addr,
+			Median: median,
+			StdDev: stdDev,
+		})
+	}
+
+	return stats, parseErr
+}
+
+func parseClusterMemberRTT(json map[string]any) (netip.AddrPort, []float64, error) {
+	var addr netip.AddrPort
+	var rtts []float64
+	var err error
+
+	// Parse state to get Addr
+	stateObj, ok := json["state"].(map[string]any)
+	if !ok {
+		return addr, nil, fmt.Errorf("missing or invalid 'state' field")
+	}
+
+	if addrStr, ok := stateObj["addr"].(string); ok {
+		addr, err = netip.ParseAddrPort(addrStr)
+		if err != nil {
+			return addr, nil, fmt.Errorf("parse 'addr' field: %w", err)
+		}
+	} else {
+		return addr, nil, fmt.Errorf("missing or invalid 'addr' field in 'state'")
+	}
+
+	// Parse RTTs
+	if rttsVal, ok := json["rtts"]; ok {
+		if rttsSlice, ok := rttsVal.([]any); ok {
+			for _, v := range rttsSlice {
+				if f, ok := v.(float64); ok {
+					rtts = append(rtts, f)
+				} else {
+					return addr, nil, fmt.Errorf("invalid rtt value type: %T", v)
+				}
+			}
+		} else {
+			return addr, nil, fmt.Errorf("invalid 'rtts' field type: %T", rttsVal)
+		}
+	} else {
+		return addr, nil, fmt.Errorf("missing 'rtts' field")
+	}
+
+	return addr, rtts, nil
+}

internal/machine/api/pb/machine.pb.go

@@ -495,6 +495,8 @@ type MachineDetails struct {
 	Machine  *MachineInfo `protobuf:"bytes,2,opt,name=machine,proto3" json:"machine,omitempty"`
 	// Current Corrosion cr-sqlite database version (Lamport timestamp) of the cluster store.
 	StoreDbVersion int64 `protobuf:"varint,3,opt,name=store_db_version,json=storeDbVersion,proto3" json:"store_db_version,omitempty"`
+	// Round-trip times to other machines in the cluster, keyed by peer machine ID.
+	Rtts map[string]*RTTStats `protobuf:"bytes,4,rep,name=rtts,proto3" json:"rtts,omitempty" protobuf_key:"bytes,1,opt,name=key,proto3" protobuf_val:"bytes,2,opt,name=value,proto3"`
 }
 
 func (x *MachineDetails) Reset() {
@@ -550,6 +552,13 @@ func (x *MachineDetails) GetStoreDbVersion() int64 {
 	return 0
 }
 
+func (x *MachineDetails) GetRtts() map[string]*RTTStats {
+	if x != nil {
+		return x.Rtts
+	}
+	return nil
+}
+
 type TokenResponse struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -958,6 +967,61 @@ func (x *WireGuardPeer) GetAllowedIps() []string {
 	return nil
 }
 
+type RTTStats struct {
+	state         protoimpl.MessageState
+	sizeCache     protoimpl.SizeCache
+	unknownFields protoimpl.UnknownFields
+
+	Median float64 `protobuf:"fixed64,1,opt,name=median,proto3" json:"median,omitempty"`
+	StdDev float64 `protobuf:"fixed64,2,opt,name=std_dev,json=stdDev,proto3" json:"std_dev,omitempty"`
+}
+
+func (x *RTTStats) Reset() {
+	*x = RTTStats{}
+	if protoimpl.UnsafeEnabled {
+		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		ms.StoreMessageInfo(mi)
+	}
+}
+
+func (x *RTTStats) String() string {
+	return protoimpl.X.MessageStringOf(x)
+}
+
+func (*RTTStats) ProtoMessage() {}
+
+func (x *RTTStats) ProtoReflect() protoreflect.Message {
+	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+	if protoimpl.UnsafeEnabled && x != nil {
+		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
+		if ms.LoadMessageInfo() == nil {
+			ms.StoreMessageInfo(mi)
+		}
+		return ms
+	}
+	return mi.MessageOf(x)
+}
+
+// Deprecated: Use RTTStats.ProtoReflect.Descriptor instead.
+func (*RTTStats) Descriptor() ([]byte, []int) {
+	return file_internal_machine_api_pb_machine_proto_rawDescGZIP(), []int{15}
+}
+
+func (x *RTTStats) GetMedian() float64 {
+	if x != nil {
+		return x.Median
+	}
+	return 0
+}
+
+func (x *RTTStats) GetStdDev() float64 {
+	if x != nil {
+		return x.StdDev
+	}
+	return 0
+}
+
 type Service_Container struct {
 	state         protoimpl.MessageState
 	sizeCache     protoimpl.SizeCache
@@ -971,7 +1035,7 @@ type Service_Container struct {
 func (x *Service_Container) Reset() {
 	*x = Service_Container{}
 	if protoimpl.UnsafeEnabled {
-		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+		mi := &file_internal_machine_api_pb_machine_proto_msgTypes[17]
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		ms.StoreMessageInfo(mi)
 	}
@@ -984,7 +1048,7 @@ func (x *Service_Container) String() string {
 func (*Service_Container) ProtoMessage() {}
 
 func (x *Service_Container) ProtoReflect() protoreflect.Message {
-	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[15]
+	mi := &file_internal_machine_api_pb_machine_proto_msgTypes[17]
 	if protoimpl.UnsafeEnabled && x != nil {
 		ms := protoimpl.X.MessageStateOf(protoimpl.Pointer(x))
 		if ms.LoadMessageInfo() == nil {
@@ -1086,7 +1150,7 @@ var file_internal_machine_api_pb_machine_proto_rawDesc = []byte{
 	0x65, 0x52, 0x65, 0x73, 0x70, 0x6f, 0x6e, 0x73, 0x65, 0x12, 0x2f, 0x0a, 0x08, 0x6d, 0x61, 0x63,
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+	0x6f, 0x33,
 }
 
 var (
@@ -1206,7 +1282,7 @@ func file_internal_machine_api_pb_machine_proto_rawDescGZIP() []byte {
 	return file_internal_machine_api_pb_machine_proto_rawDescData
 }
 
-var file_internal_machine_api_pb_machine_proto_msgTypes = make([]protoimpl.MessageInfo, 16)
+var file_internal_machine_api_pb_machine_proto_msgTypes = make([]protoimpl.MessageInfo, 18)
 var file_internal_machine_api_pb_machine_proto_goTypes = []any{
 	(*MachineInfo)(nil),                     // 0: api.MachineInfo
 	(*NetworkConfig)(nil),                   // 1: api.NetworkConfig
@@ -1223,60 +1299,64 @@ var file_internal_machine_api_pb_machine_proto_goTypes = []any{
 	(*InspectServiceResponse)(nil),          // 12: api.InspectServiceResponse
 	(*InspectWireGuardNetworkResponse)(nil), // 13: api.InspectWireGuardNetworkResponse
 	(*WireGuardPeer)(nil),                   // 14: api.WireGuardPeer
-	(*Service_Container)(nil),               // 15: api.Service.Container
+	(*RTTStats)(nil),                        // 15: api.RTTStats
-	(*IP)(nil),                              // 16: api.IP
+	nil,                                     // 16: api.MachineDetails.RttsEntry
-	(*IPPrefix)(nil),                        // 17: api.IPPrefix
+	(*Service_Container)(nil),               // 17: api.Service.Container
-	(*IPPort)(nil),                          // 18: api.IPPort
+	(*IP)(nil),                              // 18: api.IP
-	(*Metadata)(nil),                        // 19: api.Metadata
+	(*IPPrefix)(nil),                        // 19: api.IPPrefix
-	(*timestamppb.Timestamp)(nil),           // 20: google.protobuf.Timestamp
+	(*IPPort)(nil),                          // 20: api.IPPort
-	(*emptypb.Empty)(nil),                   // 21: google.protobuf.Empty
+	(*Metadata)(nil),                        // 21: api.Metadata
-	(*LogsRequest)(nil),                     // 22: api.LogsRequest
+	(*timestamppb.Timestamp)(nil),           // 22: google.protobuf.Timestamp
-	(*LogEntry)(nil),                        // 23: api.LogEntry
+	(*emptypb.Empty)(nil),                   // 23: google.protobuf.Empty
+	(*LogsRequest)(nil),                     // 24: api.LogsRequest
+	(*LogEntry)(nil),                        // 25: api.LogEntry
 }
 var file_internal_machine_api_pb_machine_proto_depIdxs = []int32{
 	1,  // 0: api.MachineInfo.network:type_name -> api.NetworkConfig
-	16, // 1: api.MachineInfo.public_ip:type_name -> api.IP
+	18, // 1: api.MachineInfo.public_ip:type_name -> api.IP
-	17, // 2: api.NetworkConfig.subnet:type_name -> api.IPPrefix
+	19, // 2: api.NetworkConfig.subnet:type_name -> api.IPPrefix
-	16, // 3: api.NetworkConfig.management_ip:type_name -> api.IP
+	18, // 3: api.NetworkConfig.management_ip:type_name -> api.IP
-	18, // 4: api.NetworkConfig.endpoints:type_name -> api.IPPort
+	20, // 4: api.NetworkConfig.endpoints:type_name -> api.IPPort
-	17, // 5: api.InitClusterRequest.network:type_name -> api.IPPrefix
+	19, // 5: api.InitClusterRequest.network:type_name -> api.IPPrefix
-	16, // 6: api.InitClusterRequest.public_ip:type_name -> api.IP
+	18, // 6: api.InitClusterRequest.public_ip:type_name -> api.IP
-	18, // 7: api.InitClusterRequest.wireguard_endpoints:type_name -> api.IPPort
+	20, // 7: api.InitClusterRequest.wireguard_endpoints:type_name -> api.IPPort
 	0,  // 8: api.InitClusterResponse.machine:type_name -> api.MachineInfo
 	0,  // 9: api.JoinClusterRequest.machine:type_name -> api.MachineInfo
 	0,  // 10: api.JoinClusterRequest.other_machines:type_name -> api.MachineInfo
 	7,  // 11: api.InspectMachineResponse.machines:type_name -> api.MachineDetails
-	19, // 12: api.MachineDetails.metadata:type_name -> api.Metadata
+	21, // 12: api.MachineDetails.metadata:type_name -> api.Metadata
 	0,  // 13: api.MachineDetails.machine:type_name -> api.MachineInfo
-	15, // 14: api.Service.containers:type_name -> api.Service.Container
+	16, // 14: api.MachineDetails.rtts:type_name -> api.MachineDetails.RttsEntry
-	10, // 15: api.InspectServiceResponse.service:type_name -> api.Service
+	17, // 15: api.Service.containers:type_name -> api.Service.Container
-	14, // 16: api.InspectWireGuardNetworkResponse.peers:type_name -> api.WireGuardPeer
+	10, // 16: api.InspectServiceResponse.service:type_name -> api.Service
-	20, // 17: api.WireGuardPeer.last_handshake_time:type_name -> google.protobuf.Timestamp
+	14, // 17: api.InspectWireGuardNetworkResponse.peers:type_name -> api.WireGuardPeer
-	21, // 18: api.Machine.CheckPrerequisites:input_type -> google.protobuf.Empty
+	22, // 18: api.WireGuardPeer.last_handshake_time:type_name -> google.protobuf.Timestamp
-	3,  // 19: api.Machine.InitCluster:input_type -> api.InitClusterRequest
+	15, // 19: api.MachineDetails.RttsEntry.value:type_name -> api.RTTStats
-	5,  // 20: api.Machine.JoinCluster:input_type -> api.JoinClusterRequest
+	23, // 20: api.Machine.CheckPrerequisites:input_type -> google.protobuf.Empty
-	21, // 21: api.Machine.Token:input_type -> google.protobuf.Empty
+	3,  // 21: api.Machine.InitCluster:input_type -> api.InitClusterRequest
-	21, // 22: api.Machine.Inspect:input_type -> google.protobuf.Empty
+	5,  // 22: api.Machine.JoinCluster:input_type -> api.JoinClusterRequest
-	21, // 23: api.Machine.InspectMachine:input_type -> google.protobuf.Empty
+	23, // 23: api.Machine.Token:input_type -> google.protobuf.Empty
-	21, // 24: api.Machine.InspectWireGuardNetwork:input_type -> google.protobuf.Empty
+	23, // 24: api.Machine.Inspect:input_type -> google.protobuf.Empty
-	9,  // 25: api.Machine.Reset:input_type -> api.ResetRequest
+	23, // 25: api.Machine.InspectMachine:input_type -> google.protobuf.Empty
-	11, // 26: api.Machine.InspectService:input_type -> api.InspectServiceRequest
+	23, // 26: api.Machine.InspectWireGuardNetwork:input_type -> google.protobuf.Empty
-	22, // 27: api.Machine.MachineLogs:input_type -> api.LogsRequest
+	9,  // 27: api.Machine.Reset:input_type -> api.ResetRequest
-	2,  // 28: api.Machine.CheckPrerequisites:output_type -> api.CheckPrerequisitesResponse
+	11, // 28: api.Machine.InspectService:input_type -> api.InspectServiceRequest
-	4,  // 29: api.Machine.InitCluster:output_type -> api.InitClusterResponse
+	24, // 29: api.Machine.MachineLogs:input_type -> api.LogsRequest
-	21, // 30: api.Machine.JoinCluster:output_type -> google.protobuf.Empty
+	2,  // 30: api.Machine.CheckPrerequisites:output_type -> api.CheckPrerequisitesResponse
-	8,  // 31: api.Machine.Token:output_type -> api.TokenResponse
+	4,  // 31: api.Machine.InitCluster:output_type -> api.InitClusterResponse
-	0,  // 32: api.Machine.Inspect:output_type -> api.MachineInfo
+	23, // 32: api.Machine.JoinCluster:output_type -> google.protobuf.Empty
-	6,  // 33: api.Machine.InspectMachine:output_type -> api.InspectMachineResponse
+	8,  // 33: api.Machine.Token:output_type -> api.TokenResponse
-	13, // 34: api.Machine.InspectWireGuardNetwork:output_type -> api.InspectWireGuardNetworkResponse
+	0,  // 34: api.Machine.Inspect:output_type -> api.MachineInfo
-	21, // 35: api.Machine.Reset:output_type -> google.protobuf.Empty
+	6,  // 35: api.Machine.InspectMachine:output_type -> api.InspectMachineResponse
-	12, // 36: api.Machine.InspectService:output_type -> api.InspectServiceResponse
+	13, // 36: api.Machine.InspectWireGuardNetwork:output_type -> api.InspectWireGuardNetworkResponse
-	23, // 37: api.Machine.MachineLogs:output_type -> api.LogEntry
+	23, // 37: api.Machine.Reset:output_type -> google.protobuf.Empty
-	28, // [28:38] is the sub-list for method output_type
+	12, // 38: api.Machine.InspectService:output_type -> api.InspectServiceResponse
-	18, // [18:28] is the sub-list for method input_type
+	25, // 39: api.Machine.MachineLogs:output_type -> api.LogEntry
-	18, // [18:18] is the sub-list for extension type_name
+	30, // [30:40] is the sub-list for method output_type
-	18, // [18:18] is the sub-list for extension extendee
+	20, // [20:30] is the sub-list for method input_type
-	0,  // [0:18] is the sub-list for field type_name
+	20, // [20:20] is the sub-list for extension type_name
+	20, // [20:20] is the sub-list for extension extendee
+	0,  // [0:20] is the sub-list for field type_name
 }
 
 func init() { file_internal_machine_api_pb_machine_proto_init() }
@@ -1467,6 +1547,18 @@ func file_internal_machine_api_pb_machine_proto_init() {
 			}
 		}
 		file_internal_machine_api_pb_machine_proto_msgTypes[15].Exporter = func(v any, i int) any {
+			switch v := v.(*RTTStats); i {
+			case 0:
+				return &v.state
+			case 1:
+				return &v.sizeCache
+			case 2:
+				return &v.unknownFields
+			default:
+				return nil
+			}
+		}
+		file_internal_machine_api_pb_machine_proto_msgTypes[17].Exporter = func(v any, i int) any {
 			switch v := v.(*Service_Container); i {
 			case 0:
 				return &v.state
@@ -1489,7 +1581,7 @@ func file_internal_machine_api_pb_machine_proto_init() {
 			GoPackagePath: reflect.TypeOf(x{}).PkgPath(),
 			RawDescriptor: file_internal_machine_api_pb_machine_proto_rawDesc,
 			NumEnums:      0,
-			NumMessages:   16,
+			NumMessages:   18,
 			NumExtensions: 0,
 			NumServices:   1,
 		},

internal/machine/api/pb/machine.proto

@@ -83,6 +83,8 @@ message MachineDetails {
   MachineInfo machine = 2;
   // Current Corrosion cr-sqlite database version (Lamport timestamp) of the cluster store.
   int64 store_db_version = 3;
+  // Round-trip times to other machines in the cluster, keyed by peer machine ID.
+  map<string, RTTStats> rtts = 4;
 }
 
 message TokenResponse {
@@ -129,3 +131,8 @@ message WireGuardPeer {
   int64 transmit_bytes = 5;
   repeated string allowed_ips = 6;
 }
+
+message RTTStats {
+  double median = 1;
+  double std_dev = 2;
+}

internal/machine/cluster/cluster.go

@@ -344,3 +344,8 @@ func (c *Cluster) RemoveMachine(ctx context.Context, req *pb.RemoveMachineReques
 
 	return &emptypb.Empty{}, nil
 }
+
+// MemberRTTs returns the average and standard deviation of round-trip times from this member to each cluster member.
+func (c *Cluster) MemberRTTs() ([]corrosion.MemberRTTStats, error) {
+	return c.corroAdmin.ClusterMemberRTTs()
+}

internal/machine/machine.go

@@ -912,6 +912,14 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
 		return nil, status.Errorf(codes.Internal, "get database version of the cluster store: %v", err)
 	}
 
+	var rtts map[string]*pb.RTTStats
+	if m.Initialised() {
+		rtts, err = m.getMachineRTTs(ctx)
+		if err != nil {
+			return nil, err
+		}
+	}
+
 	return &pb.InspectMachineResponse{
 		Machines: []*pb.MachineDetails{
 			{
@@ -926,11 +934,46 @@ func (m *Machine) InspectMachine(ctx context.Context, _ *emptypb.Empty) (*pb.Ins
 					},
 				},
 				StoreDbVersion: dbVersion,
+				Rtts:           rtts,
 			},
 		},
 	}, nil
 }
 
+// getMachineRTTs retrieves round-trip times to other machines in the cluster.
+func (m *Machine) getMachineRTTs(ctx context.Context) (map[string]*pb.RTTStats, error) {
+	rtts, err := m.cluster.MemberRTTs()
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "get member rtts: %v", err)
+	}
+
+	// List machines to map IPs to Machine IDs.
+	machines, err := m.store.ListMachines(ctx)
+	if err != nil {
+		return nil, status.Errorf(codes.Internal, "list machines: %v", err)
+	}
+
+	// Map Management IP -> Machine ID
+	ipToMachineID := make(map[netip.Addr]string)
+	for _, mach := range machines {
+		ip, _ := mach.Network.ManagementIp.ToAddr()
+		ipToMachineID[ip] = mach.Id
+	}
+
+	pbRTTs := make(map[string]*pb.RTTStats)
+	for _, stats := range rtts {
+		// Corrosion uses the management IP for gossip.
+		if mid, ok := ipToMachineID[stats.Addr.Addr()]; ok {
+			pbRTTs[mid] = &pb.RTTStats{
+				Median: stats.Median,
+				StdDev: stats.StdDev,
+			}
+		}
+	}
+
+	return pbRTTs, nil
+}
+
 // IsNetworkReady returns true if the Docker network is ready for containers.
 func (m *Machine) IsNetworkReady() bool {
 	if !m.Initialised() {

website/docs/9-cli-reference/uc_machine.md

@@ -25,5 +25,6 @@ Manage machines in the cluster.
 * [uc machine ls](uc_machine_ls.md)	 - List machines in a cluster.
 * [uc machine rename](uc_machine_rename.md)	 - Rename a machine in the cluster.
 * [uc machine rm](uc_machine_rm.md)	 - Remove a machine from a cluster and reset it.
+* [uc machine rtt](uc_machine_rtt.md)	 - Show round-trip times between machines.
 * [uc machine update](uc_machine_update.md)	 - Update machine configuration in the cluster.
 

website/docs/9-cli-reference/uc_machine_rtt.md

@@ -0,0 +1,36 @@
+# uc machine rtt
+
+Show round-trip times between machines.
+
+## Synopsis
+
+Show round-trip times between machines.
+
+Round-trip time statistics are collected from the Corrosion gossip protocol
+and represent the median of recent RTT samples between each pair of machines
+in the cluster. The values shown include the median RTT and standard deviation
+for each machine-to-machine connection.
+
+```
+uc machine rtt [flags]
+```
+
+## Options
+
+```
+  -h, --help   help for rtt
+```
+
+## Options inherited from parent commands
+
+```
+      --connect string          Connect to a remote cluster machine without using the Uncloud configuration file. [$UNCLOUD_CONNECT]
+                                Format: [ssh://]user@host[:port], ssh+go://user@host[:port], tcp://host:port, or unix:///path/to/uncloud.sock
+  -c, --context string          Name of the cluster context to use (default is the current context). [$UNCLOUD_CONTEXT]
+      --uncloud-config string   Path to the Uncloud configuration file. [$UNCLOUD_CONFIG] (default "~/.config/uncloud/config.yaml")
+```
+
+## See also
+
+* [uc machine](uc_machine.md)	 - Manage machines in the cluster.
+