Add agent operations history and manual links

README.md

@@ -342,6 +342,33 @@ APT-обновления и необходимость перезагрузки.
 health-check, число перезапусков, CPU и память. Агент сам подключается к Dashboard
 каждые 10 секунд; открывать входящий порт внутри гостевой системы не нужно.
 
+В подробностях агента systemd-службы разделяются на системные, установленные
+дополнительно и локальные unit-файлы. Для каждой службы показываются пакет и путь
+unit-файла, время запуска, число перезапусков, последний exit code, память и
+накопленное CPU-время, когда соответствующий accounting доступен в systemd.
+
+Расширенная диагностика агента включает последние сообщения проблемных служб,
+`Requires`/`After`, PID, команду запуска и слушающие порты; выявляет частые
+рестарты, OOM-kill и процессы в D-state. Отдельно отображаются top процессов по
+CPU и RAM с накопленным I/O, swap, PSI pressure, все постоянные файловые системы,
+их заполнение и использование inode.
+
+Панель «Диагностика homelab» и карта сопоставляют известные IP и порты с VM/LXC,
+агентом, systemd-службой или Docker-контейнером и настроенной HTTP/TCP-проверкой.
+Связи по PID и порту считаются подтверждёнными; совпадения только по названию
+помечаются как предположение.
+
+Для сложных reverse proxy и Docker-сетей в управлении сервисами можно сохранить
+ручную связь `сервис → агент/VMID → systemd/Docker/процесс → порт`. Она имеет
+приоритет над автоматическим определением и используется для группировки
+связанных уведомлений по первопричине.
+
+Dashboard хранит семь дней истории CPU, RAM, swap, PSI и файловых систем каждого
+агента. Из подробностей агента доступны только заранее разрешённые действия:
+перезапуск известной systemd-службы или Docker-контейнера, `reset-failed` и
+обновление списка пакетов. Агент не принимает произвольные shell-команды; каждое
+действие требует подтверждения в браузере и сохраняется в журнале управления.
+
 Откройте `Настройки → Агенты`, укажите адрес Dashboard, доступный из VM/LXC, и
 VMID. Кнопка создаст готовую команду установки. Одноразовый токен действует 15
 минут и после регистрации заменяется индивидуальным секретом агента.

agent.go

@@ -58,10 +58,25 @@ type AgentInterface struct {
 }
 
 type AgentService struct {
-	Name        string `json:"name"`
-	State       string `json:"state"`
-	SubState    string `json:"subState"`
-	Description string `json:"description"`
+	Name        string     `json:"name"`
+	State       string     `json:"state"`
+	SubState    string     `json:"subState"`
+	Description string     `json:"description"`
+	Origin      string     `json:"origin"`
+	UnitPath    string     `json:"unitPath,omitempty"`
+	Package     string     `json:"package,omitempty"`
+	Restarts    uint64     `json:"restarts"`
+	ExitCode    int        `json:"exitCode"`
+	StartedAt   int64      `json:"startedAt,omitempty"`
+	MemoryBytes uint64     `json:"memoryBytes,omitempty"`
+	CPUSeconds  float64    `json:"cpuSeconds,omitempty"`
+	MainPID     int        `json:"mainPid,omitempty"`
+	ExecStart   string     `json:"execStart,omitempty"`
+	Requires    []string   `json:"requires,omitempty"`
+	After       []string   `json:"after,omitempty"`
+	ListenPorts []int      `json:"listenPorts,omitempty"`
+	Logs        []AgentLog `json:"logs,omitempty"`
+	Flapping    bool       `json:"flapping"`
 }
 
 type AgentIssue struct {
@@ -71,30 +86,38 @@ type AgentIssue struct {
 }
 
 type AgentReport struct {
-	Hostname         string           `json:"hostname"`
-	MachineID        string           `json:"machineId"`
-	Version          string           `json:"version"`
-	OS               string           `json:"os"`
-	Arch             string           `json:"arch"`
-	OSName           string           `json:"osName"`
-	Kernel           string           `json:"kernel"`
-	UptimeSeconds    int64            `json:"uptimeSeconds"`
-	Load1            float64          `json:"load1"`
-	CPUPercent       float64          `json:"cpuPercent"`
-	MemoryTotal      uint64           `json:"memoryTotal"`
-	MemoryUsed       uint64           `json:"memoryUsed"`
-	RootTotal        uint64           `json:"rootTotal"`
-	RootUsed         uint64           `json:"rootUsed"`
-	DockerAvailable  bool             `json:"dockerAvailable"`
-	DockerError      string           `json:"dockerError,omitempty"`
-	Containers       []AgentContainer `json:"containers"`
-	Interfaces       []AgentInterface `json:"interfaces"`
-	Services         []AgentService   `json:"services"`
-	Issues           []AgentIssue     `json:"issues"`
-	UpdatesAvailable int              `json:"updatesAvailable"`
-	RebootRequired   bool             `json:"rebootRequired"`
-	InventoryAt      int64            `json:"inventoryAt"`
-	CollectedAt      int64            `json:"collectedAt"`
+	Hostname         string              `json:"hostname"`
+	MachineID        string              `json:"machineId"`
+	Version          string              `json:"version"`
+	OS               string              `json:"os"`
+	Arch             string              `json:"arch"`
+	OSName           string              `json:"osName"`
+	Kernel           string              `json:"kernel"`
+	UptimeSeconds    int64               `json:"uptimeSeconds"`
+	Load1            float64             `json:"load1"`
+	CPUPercent       float64             `json:"cpuPercent"`
+	MemoryTotal      uint64              `json:"memoryTotal"`
+	MemoryUsed       uint64              `json:"memoryUsed"`
+	SwapTotal        uint64              `json:"swapTotal"`
+	SwapUsed         uint64              `json:"swapUsed"`
+	RootTotal        uint64              `json:"rootTotal"`
+	RootUsed         uint64              `json:"rootUsed"`
+	DockerAvailable  bool                `json:"dockerAvailable"`
+	DockerError      string              `json:"dockerError,omitempty"`
+	Containers       []AgentContainer    `json:"containers"`
+	Interfaces       []AgentInterface    `json:"interfaces"`
+	Services         []AgentService      `json:"services"`
+	Issues           []AgentIssue        `json:"issues"`
+	Processes        []AgentProcess      `json:"processes"`
+	Filesystems      []AgentFilesystem   `json:"filesystems"`
+	ListenPorts      []AgentListenPort   `json:"listenPorts"`
+	Pressure         AgentPressure       `json:"pressure"`
+	OOMKills         []AgentLog          `json:"oomKills"`
+	UpdatesAvailable int                 `json:"updatesAvailable"`
+	RebootRequired   bool                `json:"rebootRequired"`
+	InventoryAt      int64               `json:"inventoryAt"`
+	CollectedAt      int64               `json:"collectedAt"`
+	ActionResults    []AgentActionResult `json:"actionResults,omitempty"`
 }
 
 type agentInventory struct {
@@ -115,6 +138,7 @@ type AgentUpdateManifest struct {
 type agentReportResponse struct {
 	Accepted bool                 `json:"accepted"`
 	Update   *AgentUpdateManifest `json:"update,omitempty"`
+	Commands []AgentCommand       `json:"commands,omitempty"`
 }
 
 var guestInventory struct {
@@ -128,6 +152,11 @@ var guestIssues struct {
 	collectedAt time.Time
 }
 
+var guestActionResults struct {
+	sync.Mutex
+	value []AgentActionResult
+}
+
 var agentBinaryInfo struct {
 	sync.Once
 	manifest AgentUpdateManifest
@@ -236,6 +265,8 @@ func (s *Store) SaveAgentReport(id, secret, remote string, report AgentReport) e
 	if !s.AuthenticateAgent(id, secret) {
 		return errors.New("агент не авторизован")
 	}
+	s.CompleteAgentActions(id, report.ActionResults)
+	report.ActionResults = nil
 	data, _ := json.Marshal(report)
 	_, err := s.db.Exec(`UPDATE agents SET hostname=?,version=?,last_seen=?,report_json=?,remote_address=? WHERE id=?`, report.Hostname, report.Version, time.Now().Unix(), string(data), remote, id)
 	return err
@@ -303,6 +334,9 @@ func runGuestAgent(opts agentOptions) error {
 	client := &http.Client{Timeout: 12 * time.Second}
 	for {
 		report := collectAgentReport()
+		guestActionResults.Lock()
+		report.ActionResults = append([]AgentActionResult(nil), guestActionResults.value...)
+		guestActionResults.Unlock()
 		data, _ := json.Marshal(report)
 		req, _ := http.NewRequest(http.MethodPost, config.Server+"/api/agent/report", bytes.NewReader(data))
 		req.Header.Set("Content-Type", "application/json")
@@ -329,7 +363,23 @@ func runGuestAgent(opts agentOptions) error {
 			}
 			if response.StatusCode == http.StatusOK {
 				var result agentReportResponse
-				if json.Unmarshal(responseData, &result) == nil && result.Update != nil && newerAgentVersion(result.Update.Version, version) {
+				if json.Unmarshal(responseData, &result) == nil {
+					if len(report.ActionResults) > 0 {
+						guestActionResults.Lock()
+						guestActionResults.value = nil
+						guestActionResults.Unlock()
+					}
+					if len(result.Commands) > 0 {
+						executed := make([]AgentActionResult, 0, len(result.Commands))
+						for _, command := range result.Commands {
+							executed = append(executed, executeAgentCommand(command))
+						}
+						guestActionResults.Lock()
+						guestActionResults.value = append(guestActionResults.value, executed...)
+						guestActionResults.Unlock()
+					}
+				}
+				if result.Update != nil && newerAgentVersion(result.Update.Version, version) {
 					if updateErr := applyAgentUpdate(client, config, *result.Update); updateErr != nil {
 						requestErr = fmt.Errorf("автообновление: %v", updateErr)
 					} else {
@@ -493,6 +543,11 @@ func collectAgentReport() AgentReport {
 	}
 	report.CPUPercent = sampleAgentCPU()
 	report.Interfaces = collectAgentInterfaces()
+	report.Processes = collectAgentProcesses()
+	report.Filesystems = collectAgentFilesystems()
+	report.ListenPorts = collectAgentListenPorts()
+	report.Pressure = collectAgentPressure()
+	report.OOMKills = cachedAgentOOMKills()
 	if data, err := os.ReadFile("/proc/meminfo"); err == nil {
 		values := map[string]uint64{}
 		for _, line := range strings.Split(string(data), "\n") {
@@ -507,6 +562,10 @@ func collectAgentReport() AgentReport {
 		if report.MemoryTotal > available {
 			report.MemoryUsed = report.MemoryTotal - available
 		}
+		report.SwapTotal = values["SwapTotal"]
+		if report.SwapTotal > values["SwapFree"] {
+			report.SwapUsed = report.SwapTotal - values["SwapFree"]
+		}
 	}
 	var stat syscall.Statfs_t
 	if syscall.Statfs("/", &stat) == nil {
@@ -595,7 +654,7 @@ func runAgentCommand(timeout time.Duration, name string, args ...string) string
 	ctx, cancel := context.WithTimeout(context.Background(), timeout)
 	defer cancel()
 	output, err := exec.CommandContext(ctx, name, args...).Output()
-	if err != nil {
+	if err != nil && len(output) == 0 {
 		return ""
 	}
 	return string(output)
@@ -622,7 +681,116 @@ func collectAgentServices() []AgentService {
 			break
 		}
 	}
-	return result
+	return enrichAgentServices(result)
+}
+
+func enrichAgentServices(services []AgentService) []AgentService {
+	if len(services) == 0 {
+		return services
+	}
+	args := []string{"show", "--no-pager", "--property=Id", "--property=FragmentPath", "--property=NRestarts", "--property=ExecMainStatus", "--property=ActiveEnterTimestampUSec", "--property=MemoryCurrent", "--property=CPUUsageNSec", "--property=MainPID", "--property=ExecStart", "--property=Requires", "--property=After"}
+	for _, service := range services {
+		args = append(args, service.Name)
+	}
+	show := runAgentCommand(8*time.Second, "systemctl", args...)
+	properties := map[string]map[string]string{}
+	paths := map[string]string{}
+	for _, record := range strings.Split(show, "\n\n") {
+		values := map[string]string{}
+		for _, line := range strings.Split(record, "\n") {
+			key, value, ok := strings.Cut(line, "=")
+			if ok {
+				values[key] = value
+			}
+		}
+		if id := values["Id"]; id != "" {
+			properties[id] = values
+			paths[id] = values["FragmentPath"]
+		}
+	}
+	pathArgs := []string{"-S"}
+	for _, service := range services {
+		if path := paths[service.Name]; path != "" {
+			pathArgs = append(pathArgs, path)
+		}
+	}
+	owners := map[string]string{}
+	packages := []string{}
+	if len(pathArgs) > 1 {
+		output := runAgentCommand(8*time.Second, "dpkg-query", pathArgs...)
+		for _, line := range strings.Split(output, "\n") {
+			left, path, ok := strings.Cut(line, ": ")
+			if !ok {
+				continue
+			}
+			pkg := strings.TrimSpace(strings.Split(left, ",")[0])
+			path = strings.TrimSpace(path)
+			if pkg != "" && path != "" {
+				owners[path] = pkg
+				packages = append(packages, pkg)
+			}
+		}
+	}
+	priorities := map[string]string{}
+	if len(packages) > 0 {
+		packageArgs := []string{"-W", "-f=${binary:Package}\t${Priority}\n"}
+		packageArgs = append(packageArgs, packages...)
+		output := runAgentCommand(8*time.Second, "dpkg-query", packageArgs...)
+		for _, line := range strings.Split(output, "\n") {
+			fields := strings.Fields(line)
+			if len(fields) >= 2 {
+				priorities[fields[0]] = fields[1]
+			}
+		}
+	}
+	for i := range services {
+		service := &services[i]
+		service.UnitPath = paths[service.Name]
+		service.Package = owners[service.UnitPath]
+		service.Origin = classifyAgentService(service.UnitPath, service.Package, priorities[service.Package])
+		values := properties[service.Name]
+		service.Restarts, _ = strconv.ParseUint(values["NRestarts"], 10, 64)
+		exit, _ := strconv.ParseInt(values["ExecMainStatus"], 10, 32)
+		service.ExitCode = int(exit)
+		started, _ := strconv.ParseInt(values["ActiveEnterTimestampUSec"], 10, 64)
+		service.StartedAt = started / 1_000_000
+		service.MemoryBytes, _ = strconv.ParseUint(values["MemoryCurrent"], 10, 64)
+		cpu, _ := strconv.ParseUint(values["CPUUsageNSec"], 10, 64)
+		service.CPUSeconds = float64(cpu) / 1_000_000_000
+		pid, _ := strconv.Atoi(values["MainPID"])
+		service.MainPID = pid
+		service.ExecStart = compactSystemdExec(values["ExecStart"])
+		service.Requires = limitedFields(values["Requires"], 12)
+		service.After = limitedFields(values["After"], 12)
+		service.Flapping = service.Restarts >= 5 && service.StartedAt > time.Now().Add(-10*time.Minute).Unix()
+		if service.State == "failed" || service.SubState == "failed" || service.Flapping {
+			service.Logs = collectAgentJournal(service.Name, 8, "-2h")
+		}
+	}
+	ports := collectAgentListenPorts()
+	for i := range services {
+		for _, port := range ports {
+			if services[i].MainPID > 0 && port.PID == services[i].MainPID {
+				services[i].ListenPorts = appendUniqueInt(services[i].ListenPorts, port.Port)
+			}
+		}
+	}
+	return services
+}
+
+func classifyAgentService(path, pkg, priority string) string {
+	switch {
+	case strings.HasPrefix(path, "/etc/systemd/") || strings.HasPrefix(path, "/usr/local/"):
+		return "local"
+	case priority == "required" || priority == "important" || priority == "standard":
+		return "system"
+	case pkg != "":
+		return "added"
+	case strings.HasPrefix(path, "/run/systemd/"):
+		return "runtime"
+	default:
+		return "system"
+	}
 }
 
 func collectAgentIssues() []AgentIssue {

agent_actions.go

@@ -0,0 +1,210 @@
+package main
+
+import (
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net"
+	"net/http"
+	"os/exec"
+	"regexp"
+	"strings"
+	"time"
+)
+
+type AgentCommand struct {
+	ID     int64  `json:"id"`
+	Action string `json:"action"`
+	Target string `json:"target,omitempty"`
+}
+
+type AgentActionResult struct {
+	ID      int64  `json:"id"`
+	Success bool   `json:"success"`
+	Message string `json:"message"`
+}
+
+type AgentAction struct {
+	ID          int64  `json:"id"`
+	AgentID     string `json:"agentId"`
+	AgentName   string `json:"agentName"`
+	Action      string `json:"action"`
+	Target      string `json:"target"`
+	RequestedAt int64  `json:"requestedAt"`
+	StartedAt   *int64 `json:"startedAt,omitempty"`
+	CompletedAt *int64 `json:"completedAt,omitempty"`
+	Status      string `json:"status"`
+	Result      string `json:"result"`
+}
+
+var safeUnitName = regexp.MustCompile(`^[A-Za-z0-9_.@:-]+\.service$`)
+var safeContainerName = regexp.MustCompile(`^[A-Za-z0-9_.-]{1,128}$`)
+
+func (s *Store) QueueAgentAction(agentID, action, target string) (AgentAction, error) {
+	action, target = strings.TrimSpace(action), strings.TrimSpace(target)
+	var raw, name string
+	if err := s.db.QueryRow(`SELECT report_json,name FROM agents WHERE id=?`, agentID).Scan(&raw, &name); err != nil {
+		return AgentAction{}, fmt.Errorf("агент не найден")
+	}
+	var report AgentReport
+	_ = json.Unmarshal([]byte(raw), &report)
+	valid := false
+	switch action {
+	case "systemd-restart", "systemd-reset-failed":
+		if safeUnitName.MatchString(target) {
+			for _, service := range report.Services {
+				if service.Name == target {
+					valid = true
+					break
+				}
+			}
+		}
+	case "docker-restart":
+		if safeContainerName.MatchString(target) {
+			for _, container := range report.Containers {
+				if container.ID == target || container.Name == target {
+					valid = true
+					break
+				}
+			}
+		}
+	case "updates-refresh":
+		valid = target == ""
+	}
+	if !valid {
+		return AgentAction{}, fmt.Errorf("действие или цель не входят в разрешённый список")
+	}
+	now := time.Now().Unix()
+	result, err := s.db.Exec(`INSERT INTO agent_actions(agent_id,action,target,requested_at,status) VALUES(?,?,?,?, 'queued')`, agentID, action, target, now)
+	if err != nil {
+		return AgentAction{}, err
+	}
+	id, _ := result.LastInsertId()
+	return AgentAction{ID: id, AgentID: agentID, AgentName: name, Action: action, Target: target, RequestedAt: now, Status: "queued"}, nil
+}
+
+func (s *Store) DispatchAgentActions(agentID string) ([]AgentCommand, error) {
+	tx, err := s.db.Begin()
+	if err != nil {
+		return nil, err
+	}
+	defer tx.Rollback()
+	_, _ = tx.Exec(`UPDATE agent_actions SET status='queued',started_at=NULL WHERE agent_id=? AND status='running' AND started_at<?`, agentID, time.Now().Add(-5*time.Minute).Unix())
+	rows, err := tx.Query(`SELECT id,action,target FROM agent_actions WHERE agent_id=? AND status='queued' ORDER BY id LIMIT 3`, agentID)
+	if err != nil {
+		return nil, err
+	}
+	var commands []AgentCommand
+	for rows.Next() {
+		var c AgentCommand
+		if err = rows.Scan(&c.ID, &c.Action, &c.Target); err != nil {
+			rows.Close()
+			return nil, err
+		}
+		commands = append(commands, c)
+	}
+	rows.Close()
+	now := time.Now().Unix()
+	for _, c := range commands {
+		if _, err = tx.Exec(`UPDATE agent_actions SET status='running',started_at=? WHERE id=?`, now, c.ID); err != nil {
+			return nil, err
+		}
+	}
+	return commands, tx.Commit()
+}
+
+func (s *Store) CompleteAgentActions(agentID string, results []AgentActionResult) {
+	now := time.Now().Unix()
+	for _, result := range results {
+		status := "failed"
+		if result.Success {
+			status = "completed"
+		}
+		message := result.Message
+		if len(message) > 4000 {
+			message = message[:4000]
+		}
+		_, _ = s.db.Exec(`UPDATE agent_actions SET status=?,result=?,completed_at=? WHERE id=? AND agent_id=? AND status='running'`, status, message, now, result.ID, agentID)
+	}
+}
+
+func (s *Store) AgentActions(limit int) ([]AgentAction, error) {
+	if limit < 1 || limit > 200 {
+		limit = 100
+	}
+	rows, err := s.db.Query(`SELECT a.id,a.agent_id,g.name,a.action,a.target,a.requested_at,a.started_at,a.completed_at,a.status,a.result FROM agent_actions a JOIN agents g ON g.id=a.agent_id ORDER BY a.id DESC LIMIT ?`, limit)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []AgentAction
+	for rows.Next() {
+		var v AgentAction
+		if err = rows.Scan(&v.ID, &v.AgentID, &v.AgentName, &v.Action, &v.Target, &v.RequestedAt, &v.StartedAt, &v.CompletedAt, &v.Status, &v.Result); err != nil {
+			return nil, err
+		}
+		out = append(out, v)
+	}
+	return out, rows.Err()
+}
+
+func executeAgentCommand(command AgentCommand) AgentActionResult {
+	result := AgentActionResult{ID: command.ID}
+	var output string
+	switch command.Action {
+	case "systemd-restart":
+		output = runAgentCombinedCommand(30*time.Second, "systemctl", "restart", command.Target)
+	case "systemd-reset-failed":
+		output = runAgentCombinedCommand(15*time.Second, "systemctl", "reset-failed", command.Target)
+	case "docker-restart":
+		output = restartAgentContainer(command.Target)
+	case "updates-refresh":
+		guestInventory.Lock()
+		guestInventory.value.CollectedAt = time.Time{}
+		guestInventory.Unlock()
+		result.Success = true
+		result.Message = "Проверка обновлений поставлена в очередь"
+		return result
+	default:
+		result.Message = "Команда не разрешена"
+		return result
+	}
+	result.Success = !strings.HasPrefix(output, "ERROR: ")
+	result.Message = strings.TrimSpace(output)
+	if result.Message == "" && result.Success {
+		result.Message = "Выполнено успешно"
+	}
+	return result
+}
+
+func runAgentCombinedCommand(timeout time.Duration, name string, args ...string) string {
+	ctx, cancel := context.WithTimeout(context.Background(), timeout)
+	defer cancel()
+	output, err := exec.CommandContext(ctx, name, args...).CombinedOutput()
+	message := strings.TrimSpace(string(output))
+	if err != nil {
+		return "ERROR: " + err.Error() + ": " + message
+	}
+	return message
+}
+
+func restartAgentContainer(target string) string {
+	transport := &http.Transport{DialContext: func(ctx context.Context, _, _ string) (net.Conn, error) {
+		return (&net.Dialer{}).DialContext(ctx, "unix", "/var/run/docker.sock")
+	}}
+	defer transport.CloseIdleConnections()
+	client := &http.Client{Transport: transport, Timeout: 35 * time.Second}
+	request, _ := http.NewRequest(http.MethodPost, "http://docker/containers/"+target+"/restart?t=10", bytes.NewReader(nil))
+	response, err := client.Do(request)
+	if err != nil {
+		return "ERROR: " + err.Error()
+	}
+	defer response.Body.Close()
+	body, _ := io.ReadAll(io.LimitReader(response.Body, 4096))
+	if response.StatusCode >= 300 {
+		return "ERROR: Docker вернул " + response.Status + ": " + strings.TrimSpace(string(body))
+	}
+	return "Контейнер перезапущен"
+}

agent_actions_test.go

@@ -0,0 +1,54 @@
+package main
+
+import (
+	"encoding/json"
+	"testing"
+	"time"
+)
+
+func TestAgentActionAllowlistAndLifecycle(t *testing.T) {
+	store, err := openStore(":memory:")
+	if err != nil {
+		t.Fatal(err)
+	}
+	defer store.Close()
+	report, _ := json.Marshal(AgentReport{Services: []AgentService{{Name: "gitea.service"}}, Containers: []AgentContainer{{ID: "abc123", Name: "gitea"}}})
+	_, err = store.db.Exec(`INSERT INTO agents(id,name,secret_hash,enrolled_at,last_seen,report_json) VALUES('a','agent','x',?,?,?)`, time.Now().Unix(), time.Now().Unix(), string(report))
+	if err != nil {
+		t.Fatal(err)
+	}
+	if _, err = store.QueueAgentAction("a", "systemd-restart", "../../bad.service"); err == nil {
+		t.Fatal("unsafe unit accepted")
+	}
+	action, err := store.QueueAgentAction("a", "systemd-restart", "gitea.service")
+	if err != nil {
+		t.Fatal(err)
+	}
+	commands, err := store.DispatchAgentActions("a")
+	if err != nil || len(commands) != 1 || commands[0].ID != action.ID {
+		t.Fatalf("commands=%#v err=%v", commands, err)
+	}
+	store.CompleteAgentActions("a", []AgentActionResult{{ID: action.ID, Success: true, Message: "ok"}})
+	items, err := store.AgentActions(10)
+	if err != nil || len(items) != 1 || items[0].Status != "completed" {
+		t.Fatalf("items=%#v err=%v", items, err)
+	}
+}
+
+func TestManualServiceLinkGroupsOfflineAlerts(t *testing.T) {
+	metrics := dashboardMetrics{Agents: []ManagedAgent{{ID: "a", Name: "app", VMID: 105, Online: false}}, ServiceLinks: []ServiceLink{{ServiceID: 7, AgentID: "a", VMID: 105}}, Services: ServicesMetrics{Services: []ServiceStatus{{MonitoredService: MonitoredService{ID: 7, Name: "Gitea"}, Endpoints: []ServiceEndpointStatus{{Kind: "local", Up: false}}}}}}
+	alerts := []Alert{{ID: "agent-offline-a-105"}, {ID: "service-7-local"}, {ID: "other"}}
+	grouped := groupLinkedAlerts(metrics, alerts)
+	if len(grouped) != 2 {
+		t.Fatalf("grouped=%#v", grouped)
+	}
+	found := false
+	for _, alert := range grouped {
+		if alert.ID == "group-agent-offline-a-105" {
+			found = true
+		}
+	}
+	if !found {
+		t.Fatalf("group alert missing: %#v", grouped)
+	}
+}

agent_diagnostics.go

@@ -0,0 +1,329 @@
+package main
+
+import (
+	"bufio"
+	"encoding/json"
+	"net"
+	"os"
+	"path/filepath"
+	"regexp"
+	"sort"
+	"strconv"
+	"strings"
+	"sync"
+	"syscall"
+	"time"
+)
+
+type AgentLog struct {
+	Time    int64  `json:"time"`
+	Message string `json:"message"`
+}
+
+type AgentProcess struct {
+	PID         int     `json:"pid"`
+	Name        string  `json:"name"`
+	State       string  `json:"state"`
+	CPUPercent  float64 `json:"cpuPercent"`
+	MemoryBytes uint64  `json:"memoryBytes"`
+	ReadBytes   uint64  `json:"readBytes"`
+	WriteBytes  uint64  `json:"writeBytes"`
+	Elapsed     int64   `json:"elapsedSeconds"`
+	Command     string  `json:"command"`
+}
+
+type AgentFilesystem struct {
+	Device        string  `json:"device"`
+	Mountpoint    string  `json:"mountpoint"`
+	Type          string  `json:"type"`
+	TotalBytes    uint64  `json:"totalBytes"`
+	UsedBytes     uint64  `json:"usedBytes"`
+	UsedPercent   float64 `json:"usedPercent"`
+	InodesTotal   uint64  `json:"inodesTotal"`
+	InodesUsed    uint64  `json:"inodesUsed"`
+	InodesPercent float64 `json:"inodesPercent"`
+}
+
+type AgentListenPort struct {
+	Protocol string `json:"protocol"`
+	Address  string `json:"address"`
+	Port     int    `json:"port"`
+	PID      int    `json:"pid,omitempty"`
+	Process  string `json:"process,omitempty"`
+}
+
+type AgentPressureValue struct {
+	Avg10  float64 `json:"avg10"`
+	Avg60  float64 `json:"avg60"`
+	Avg300 float64 `json:"avg300"`
+}
+
+type AgentPressure struct {
+	CPU    AgentPressureValue `json:"cpu"`
+	Memory AgentPressureValue `json:"memory"`
+	IO     AgentPressureValue `json:"io"`
+}
+
+var agentOOMCache struct {
+	sync.Mutex
+	value []AgentLog
+	at    time.Time
+}
+
+func compactSystemdExec(value string) string {
+	if pathAt := strings.Index(value, "path="); pathAt >= 0 {
+		value = value[pathAt+5:]
+	}
+	if end := strings.IndexAny(value, " ;}"); end > 0 {
+		value = value[:end]
+	}
+	if len(value) > 240 {
+		value = value[:240]
+	}
+	return strings.TrimSpace(value)
+}
+
+func limitedFields(value string, limit int) []string {
+	fields := strings.Fields(value)
+	if len(fields) > limit {
+		fields = fields[:limit]
+	}
+	return fields
+}
+
+func appendUniqueInt(items []int, value int) []int {
+	for _, item := range items {
+		if item == value {
+			return items
+		}
+	}
+	return append(items, value)
+}
+
+func collectAgentJournal(unit string, limit int, since string) []AgentLog {
+	args := []string{"--no-pager", "-o", "json", "--reverse", "-n", strconv.Itoa(limit), "--since", since}
+	if unit != "" {
+		args = append(args, "-u", unit)
+	}
+	output := runAgentCommand(6*time.Second, "journalctl", args...)
+	result := []AgentLog{}
+	for _, line := range strings.Split(output, "\n") {
+		var entry struct {
+			Message   any    `json:"MESSAGE"`
+			Timestamp string `json:"__REALTIME_TIMESTAMP"`
+		}
+		if json.Unmarshal([]byte(line), &entry) != nil {
+			continue
+		}
+		message, ok := entry.Message.(string)
+		if !ok || strings.TrimSpace(message) == "" {
+			continue
+		}
+		microseconds, _ := strconv.ParseInt(entry.Timestamp, 10, 64)
+		result = append(result, AgentLog{Time: microseconds / 1_000_000, Message: message})
+	}
+	return result
+}
+
+func cachedAgentOOMKills() []AgentLog {
+	agentOOMCache.Lock()
+	defer agentOOMCache.Unlock()
+	if time.Since(agentOOMCache.at) < time.Minute {
+		return agentOOMCache.value
+	}
+	output := runAgentCommand(6*time.Second, "journalctl", "-k", "--since", "24 hours ago", "--reverse", "--no-pager", "-o", "json", "-g", "Out of memory|Killed process")
+	result := []AgentLog{}
+	for _, line := range strings.Split(output, "\n") {
+		var entry struct {
+			Message   any    `json:"MESSAGE"`
+			Timestamp string `json:"__REALTIME_TIMESTAMP"`
+		}
+		if json.Unmarshal([]byte(line), &entry) != nil {
+			continue
+		}
+		message, ok := entry.Message.(string)
+		if !ok {
+			continue
+		}
+		microseconds, _ := strconv.ParseInt(entry.Timestamp, 10, 64)
+		result = append(result, AgentLog{Time: microseconds / 1_000_000, Message: message})
+		if len(result) >= 20 {
+			break
+		}
+	}
+	agentOOMCache.value, agentOOMCache.at = result, time.Now()
+	return result
+}
+
+func collectAgentProcesses() []AgentProcess {
+	result := []AgentProcess{}
+	seen := map[int]bool{}
+	for _, sortBy := range []string{"-pcpu", "-rss"} {
+		output := runAgentCommand(5*time.Second, "ps", "-eo", "pid=,comm=,state=,pcpu=,rss=,etimes=,args=", "--sort="+sortBy)
+		added := 0
+		for _, line := range strings.Split(output, "\n") {
+			fields := strings.Fields(line)
+			if len(fields) < 7 {
+				continue
+			}
+			pid, err := strconv.Atoi(fields[0])
+			if err != nil || seen[pid] {
+				continue
+			}
+			seen[pid] = true
+			cpu, _ := strconv.ParseFloat(fields[3], 64)
+			rss, _ := strconv.ParseUint(fields[4], 10, 64)
+			elapsed, _ := strconv.ParseInt(fields[5], 10, 64)
+			item := AgentProcess{PID: pid, Name: fields[1], State: fields[2], CPUPercent: cpu, MemoryBytes: rss * 1024, Elapsed: elapsed, Command: strings.Join(fields[6:], " ")}
+			item.ReadBytes, item.WriteBytes = readAgentProcessIO(pid)
+			result = append(result, item)
+			added++
+			if added >= 12 || len(result) >= 24 {
+				break
+			}
+		}
+	}
+	return result
+}
+
+func readAgentProcessIO(pid int) (uint64, uint64) {
+	data, err := os.ReadFile(filepath.Join("/proc", strconv.Itoa(pid), "io"))
+	if err != nil {
+		return 0, 0
+	}
+	values := map[string]uint64{}
+	for _, line := range strings.Split(string(data), "\n") {
+		fields := strings.Fields(line)
+		if len(fields) != 2 {
+			continue
+		}
+		values[strings.TrimSuffix(fields[0], ":")], _ = strconv.ParseUint(fields[1], 10, 64)
+	}
+	return values["read_bytes"], values["write_bytes"]
+}
+
+func collectAgentFilesystems() []AgentFilesystem {
+	file, err := os.Open("/proc/self/mounts")
+	if err != nil {
+		return nil
+	}
+	defer file.Close()
+	excluded := map[string]bool{"proc": true, "sysfs": true, "devtmpfs": true, "devpts": true, "tmpfs": true, "cgroup": true, "cgroup2": true, "overlay": true, "squashfs": true, "nsfs": true, "tracefs": true, "debugfs": true, "securityfs": true, "pstore": true, "mqueue": true, "hugetlbfs": true, "fusectl": true, "configfs": true, "autofs": true, "rpc_pipefs": true}
+	seen := map[string]bool{}
+	result := []AgentFilesystem{}
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		fields := strings.Fields(scanner.Text())
+		if len(fields) < 3 || excluded[fields[2]] || seen[fields[1]] {
+			continue
+		}
+		mountpoint := strings.ReplaceAll(fields[1], `\040`, " ")
+		var stat syscall.Statfs_t
+		if syscall.Statfs(mountpoint, &stat) != nil || stat.Blocks == 0 {
+			continue
+		}
+		seen[mountpoint] = true
+		total := stat.Blocks * uint64(stat.Bsize)
+		free := stat.Bavail * uint64(stat.Bsize)
+		used := total - free
+		item := AgentFilesystem{Device: fields[0], Mountpoint: mountpoint, Type: fields[2], TotalBytes: total, UsedBytes: used, UsedPercent: float64(used) / float64(total) * 100, InodesTotal: stat.Files}
+		if stat.Files > stat.Ffree {
+			item.InodesUsed = stat.Files - stat.Ffree
+			item.InodesPercent = float64(item.InodesUsed) / float64(stat.Files) * 100
+		}
+		result = append(result, item)
+		if len(result) >= 30 {
+			break
+		}
+	}
+	sort.Slice(result, func(i, j int) bool { return result[i].Mountpoint < result[j].Mountpoint })
+	return result
+}
+
+var ssPIDPattern = regexp.MustCompile(`pid=([0-9]+)`)
+var ssNamePattern = regexp.MustCompile(`users:\(\(\"([^\"]+)\"`)
+
+func collectAgentListenPorts() []AgentListenPort {
+	output := runAgentCommand(5*time.Second, "ss", "-H", "-lntup")
+	result := []AgentListenPort{}
+	seen := map[string]bool{}
+	for _, line := range strings.Split(output, "\n") {
+		fields := strings.Fields(line)
+		if len(fields) < 5 {
+			continue
+		}
+		protocol := strings.ToLower(fields[0])
+		local := ""
+		for _, field := range fields[1:] {
+			if strings.Contains(field, ":") && !strings.Contains(field, "users:") {
+				local = field
+				break
+			}
+		}
+		if local == "" {
+			continue
+		}
+		address, portText, err := net.SplitHostPort(local)
+		if err != nil {
+			idx := strings.LastIndex(local, ":")
+			if idx < 0 {
+				continue
+			}
+			address, portText = local[:idx], local[idx+1:]
+		}
+		port, _ := strconv.Atoi(portText)
+		if port <= 0 {
+			continue
+		}
+		pid := 0
+		if match := ssPIDPattern.FindStringSubmatch(line); len(match) > 1 {
+			pid, _ = strconv.Atoi(match[1])
+		}
+		process := ""
+		if match := ssNamePattern.FindStringSubmatch(line); len(match) > 1 {
+			process = match[1]
+		}
+		key := protocol + "|" + address + "|" + portText + "|" + strconv.Itoa(pid)
+		if seen[key] {
+			continue
+		}
+		seen[key] = true
+		result = append(result, AgentListenPort{Protocol: protocol, Address: address, Port: port, PID: pid, Process: process})
+	}
+	sort.Slice(result, func(i, j int) bool {
+		if result[i].Port == result[j].Port {
+			return result[i].Protocol < result[j].Protocol
+		}
+		return result[i].Port < result[j].Port
+	})
+	return result
+}
+
+func collectAgentPressure() AgentPressure {
+	return AgentPressure{CPU: readPressure("/proc/pressure/cpu"), Memory: readPressure("/proc/pressure/memory"), IO: readPressure("/proc/pressure/io")}
+}
+
+func readPressure(path string) AgentPressureValue {
+	data, err := os.ReadFile(path)
+	if err != nil {
+		return AgentPressureValue{}
+	}
+	line := strings.SplitN(string(data), "\n", 2)[0]
+	value := AgentPressureValue{}
+	for _, field := range strings.Fields(line) {
+		key, raw, ok := strings.Cut(field, "=")
+		if !ok {
+			continue
+		}
+		number, _ := strconv.ParseFloat(raw, 64)
+		switch key {
+		case "avg10":
+			value.Avg10 = number
+		case "avg60":
+			value.Avg60 = number
+		case "avg300":
+			value.Avg300 = number
+		}
+	}
+	return value
+}

agent_test.go

@@ -60,6 +60,30 @@ func TestParseAgentIssues(t *testing.T) {
 	}
 }
 
+func TestClassifyAgentService(t *testing.T) {
+	cases := []struct{ path, pkg, priority, want string }{{"/lib/systemd/system/cron.service", "cron", "important", "system"}, {"/lib/systemd/system/jellyfin.service", "jellyfin", "optional", "added"}, {"/etc/systemd/system/my.service", "", "", "local"}, {"/run/systemd/system/transient.service", "", "", "runtime"}}
+	for _, tc := range cases {
+		if got := classifyAgentService(tc.path, tc.pkg, tc.priority); got != tc.want {
+			t.Errorf("%s: got %s want %s", tc.path, got, tc.want)
+		}
+	}
+}
+
+func TestAgentServiceDiagnosticsHelpers(t *testing.T) {
+	if got := compactSystemdExec(`{ path=/usr/bin/example ; argv[]=/usr/bin/example --serve ; }`); got != "/usr/bin/example" {
+		t.Fatalf("unexpected executable: %q", got)
+	}
+	fields := limitedFields("a b c d", 2)
+	if len(fields) != 2 || fields[0] != "a" || fields[1] != "b" {
+		t.Fatalf("unexpected limited fields: %#v", fields)
+	}
+	ports := appendUniqueInt([]int{80}, 80)
+	ports = appendUniqueInt(ports, 443)
+	if len(ports) != 2 || ports[1] != 443 {
+		t.Fatalf("unexpected ports: %#v", ports)
+	}
+}
+
 func TestAgentReportAuthenticationAndOfflineState(t *testing.T) {
 	store, err := openStore(":memory:")
 	if err != nil {
@@ -101,3 +125,22 @@ func TestAgentProblemsBecomeMaintenanceAwareAlerts(t *testing.T) {
 		t.Fatalf("active=%d planned=%d alerts=%#v", len(active), len(planned), alerts)
 	}
 }
+
+func TestAgentDiagnosticsBecomeAlerts(t *testing.T) {
+	metrics := dashboardMetrics{Agents: []ManagedAgent{{ID: "node", Name: "app", VMID: 105, Online: true, Report: AgentReport{
+		Services:    []AgentService{{Name: "web.service", State: "active", Flapping: true, Restarts: 8, StartedAt: time.Now().Unix()}},
+		Filesystems: []AgentFilesystem{{Mountpoint: "/data", TotalBytes: 1000, UsedBytes: 950, UsedPercent: 95}},
+	}}}}
+	alerts := evaluateAlerts(metrics, defaultThresholds())
+	wanted := map[string]bool{"agent-flapping-node-web.service-105": false, "agent-filesystem-node-/data-105": false}
+	for _, alert := range alerts {
+		if _, ok := wanted[alert.ID]; ok {
+			wanted[alert.ID] = true
+		}
+	}
+	for id, found := range wanted {
+		if !found {
+			t.Fatalf("missing alert %s in %#v", id, alerts)
+		}
+	}
+}

alert_events.go

@@ -124,10 +124,22 @@ func (s *Store) AcknowledgeAlert(eventID int64) error {
 }
 
 func (s *Store) AlertHistory(limit int) ([]AlertEvent, error) {
+	return s.AlertHistoryBetween(limit, 0, 0)
+}
+
+func (s *Store) AlertHistoryBetween(limit int, from, to int64) ([]AlertEvent, error) {
 	if limit < 1 || limit > 500 {
 		limit = 200
 	}
-	rows, err := s.db.Query(`SELECT id,alert_key,severity,source,title,message,first_seen,last_seen,resolved_at,acknowledged_at,planned,maintenance_reason FROM alert_events ORDER BY first_seen DESC LIMIT ?`, limit)
+	query := `SELECT id,alert_key,severity,source,title,message,first_seen,last_seen,resolved_at,acknowledged_at,planned,maintenance_reason FROM alert_events`
+	args := []any{}
+	if from > 0 && to > from {
+		query += ` WHERE first_seen>=? AND first_seen<?`
+		args = append(args, from, to)
+	}
+	query += ` ORDER BY first_seen DESC LIMIT ?`
+	args = append(args, limit)
+	rows, err := s.db.Query(query, args...)
 	if err != nil {
 		return nil, err
 	}

alerts.go

@@ -215,8 +215,22 @@ func evaluateAlerts(metrics dashboardMetrics, thresholds AlertThresholds) []Aler
 		for _, service := range agent.Report.Services {
 			if service.State == "failed" || service.SubState == "failed" {
 				add("agent-systemd-"+agent.ID+"-"+service.Name+vmSuffix, "critical", "Агенты", agent.Name+": упала служба "+service.Name, fmt.Sprintf("%s · VMID %d.", firstNonEmpty(service.Description, service.SubState), agent.VMID))
+			} else if service.Flapping {
+				add("agent-flapping-"+agent.ID+"-"+service.Name+vmSuffix, "warning", "Агенты", agent.Name+": служба постоянно перезапускается", fmt.Sprintf("%s: %d рестартов, последний запуск %s · VMID %d.", service.Name, service.Restarts, time.Unix(service.StartedAt, 0).Format("15:04:05"), agent.VMID))
 			}
 		}
+		for _, filesystem := range agent.Report.Filesystems {
+			if filesystem.UsedPercent >= 90 {
+				add("agent-filesystem-"+agent.ID+"-"+filesystem.Mountpoint+vmSuffix, "critical", "Агенты", agent.Name+": заканчивается место "+filesystem.Mountpoint, fmt.Sprintf("Заполнено %.1f%%, свободно %.1f GB · VMID %d.", filesystem.UsedPercent, float64(filesystem.TotalBytes-filesystem.UsedBytes)/1073741824, agent.VMID))
+			}
+			if filesystem.InodesPercent >= 90 {
+				add("agent-inodes-"+agent.ID+"-"+filesystem.Mountpoint+vmSuffix, "critical", "Агенты", agent.Name+": заканчиваются inode "+filesystem.Mountpoint, fmt.Sprintf("Использовано %.1f%% inode · VMID %d.", filesystem.InodesPercent, agent.VMID))
+			}
+		}
+		if len(agent.Report.OOMKills) > 0 {
+			latest := agent.Report.OOMKills[0]
+			add("agent-oom-"+agent.ID+vmSuffix, "critical", "Агенты", agent.Name+": ядро завершало процессы из-за нехватки памяти", fmt.Sprintf("%s · %s · VMID %d.", time.Unix(latest.Time, 0).Format("02.01 15:04"), latest.Message, agent.VMID))
+		}
 		if agent.Report.RebootRequired {
 			add("agent-reboot-"+agent.ID+vmSuffix, "info", "Агенты", agent.Name+": требуется перезагрузка", fmt.Sprintf("Обновления системы запросили перезагрузку · VMID %d.", agent.VMID))
 		}

history.go

@@ -64,6 +64,30 @@ func (s *Store) AddEntityMetrics(metrics dashboardMetrics) {
 			s.AddEntityHistory("backup-duration", "VMID "+task.ID, ts, &duration, nil)
 		}
 	}
+	for _, agent := range metrics.Agents {
+		if !agent.Online {
+			continue
+		}
+		name := agent.ID + " · " + agent.Name
+		cpu := agent.Report.CPUPercent
+		memory := float64(0)
+		if agent.Report.MemoryTotal > 0 {
+			memory = float64(agent.Report.MemoryUsed) / float64(agent.Report.MemoryTotal) * 100
+		}
+		swap := float64(0)
+		if agent.Report.SwapTotal > 0 {
+			swap = float64(agent.Report.SwapUsed) / float64(agent.Report.SwapTotal) * 100
+		}
+		s.AddEntityHistory("agent-resource", name, ts, &cpu, &memory)
+		s.AddEntityHistory("agent-swap", name, ts, &swap, nil)
+		pressure := agent.Report.Pressure.IO.Avg10
+		s.AddEntityHistory("agent-pressure", name, ts, &pressure, nil)
+		for _, filesystem := range agent.Report.Filesystems {
+			used := filesystem.UsedPercent
+			inodes := filesystem.InodesPercent
+			s.AddEntityHistory("agent-filesystem", name+" · "+filesystem.Mountpoint, ts, &used, &inodes)
+		}
+	}
 	s.PruneEntityHistory()
 }
 

service_links.go

@@ -0,0 +1,110 @@
+package main
+
+import (
+	"fmt"
+	"sort"
+	"strings"
+)
+
+type ServiceLink struct {
+	ServiceID     int64  `json:"serviceId"`
+	AgentID       string `json:"agentId"`
+	VMID          int    `json:"vmid"`
+	ComponentType string `json:"componentType"`
+	ComponentName string `json:"componentName"`
+	Port          int    `json:"port"`
+}
+
+func (s *Store) ServiceLinks() ([]ServiceLink, error) {
+	rows, err := s.db.Query(`SELECT service_id,agent_id,vmid,component_type,component_name,port FROM service_links ORDER BY service_id`)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []ServiceLink
+	for rows.Next() {
+		var v ServiceLink
+		if err = rows.Scan(&v.ServiceID, &v.AgentID, &v.VMID, &v.ComponentType, &v.ComponentName, &v.Port); err != nil {
+			return nil, err
+		}
+		out = append(out, v)
+	}
+	return out, rows.Err()
+}
+
+func (s *Store) SaveServiceLink(v ServiceLink) (ServiceLink, error) {
+	v.AgentID = strings.TrimSpace(v.AgentID)
+	v.ComponentType = strings.TrimSpace(v.ComponentType)
+	v.ComponentName = strings.TrimSpace(v.ComponentName)
+	if v.ServiceID <= 0 {
+		return v, fmt.Errorf("выберите сервис")
+	}
+	if v.AgentID == "" && v.VMID <= 0 {
+		return v, fmt.Errorf("выберите агент или VMID")
+	}
+	if v.ComponentType != "" && v.ComponentType != "systemd" && v.ComponentType != "docker" && v.ComponentType != "process" {
+		return v, fmt.Errorf("неизвестный тип компонента")
+	}
+	if v.Port < 0 || v.Port > 65535 {
+		return v, fmt.Errorf("некорректный порт")
+	}
+	_, err := s.db.Exec(`INSERT INTO service_links(service_id,agent_id,vmid,component_type,component_name,port) VALUES(?,?,?,?,?,?) ON CONFLICT(service_id) DO UPDATE SET agent_id=excluded.agent_id,vmid=excluded.vmid,component_type=excluded.component_type,component_name=excluded.component_name,port=excluded.port`, v.ServiceID, v.AgentID, v.VMID, v.ComponentType, v.ComponentName, v.Port)
+	return v, err
+}
+func (s *Store) DeleteServiceLink(serviceID int64) error {
+	_, err := s.db.Exec(`DELETE FROM service_links WHERE service_id=?`, serviceID)
+	return err
+}
+
+func groupLinkedAlerts(metrics dashboardMetrics, alerts []Alert) []Alert {
+	if len(metrics.ServiceLinks) == 0 {
+		return alerts
+	}
+	agentOffline := map[string]ManagedAgent{}
+	for _, agent := range metrics.Agents {
+		if !agent.Online {
+			agentOffline[agent.ID] = agent
+		}
+	}
+	affected := map[string][]string{}
+	remove := map[string]bool{}
+	for _, link := range metrics.ServiceLinks {
+		agent, offline := agentOffline[link.AgentID]
+		if !offline {
+			continue
+		}
+		for _, service := range metrics.Services.Services {
+			if service.ID != link.ServiceID {
+				continue
+			}
+			for _, endpoint := range service.Endpoints {
+				if !endpoint.Up {
+					key := fmt.Sprintf("service-%d-%s", service.ID, endpoint.Kind)
+					remove[key] = true
+					affected[agent.ID] = append(affected[agent.ID], service.Name)
+				}
+			}
+		}
+	}
+	if len(affected) == 0 {
+		return alerts
+	}
+	out := make([]Alert, 0, len(alerts))
+	for _, alert := range alerts {
+		skip := remove[alert.ID]
+		for agentID := range affected {
+			if alert.ID == "agent-offline-"+agentID+fmt.Sprintf("-%d", agentOffline[agentID].VMID) {
+				skip = true
+			}
+		}
+		if !skip {
+			out = append(out, alert)
+		}
+	}
+	for agentID, names := range affected {
+		sort.Strings(names)
+		agent := agentOffline[agentID]
+		out = append(out, Alert{ID: "group-agent-offline-" + agentID + fmt.Sprintf("-%d", agent.VMID), Severity: "critical", Source: "Корреляция", Title: agent.Name + ": агент недоступен, связанные сервисы не отвечают", Message: fmt.Sprintf("VMID %d. Затронуто сервисов: %d — %s. Вероятная первопричина: недоступна гостевая система или агент.", agent.VMID, len(names), strings.Join(names, ", "))})
+	}
+	return out
+}

store.go

@@ -140,6 +140,9 @@ func openStore(path string) (*Store, error) {
 		`CREATE INDEX IF NOT EXISTS entity_history_kind_ts_idx ON entity_history(kind,ts)`,
 		`CREATE TABLE IF NOT EXISTS agent_enrollment_tokens (token_hash TEXT PRIMARY KEY, created_at INTEGER NOT NULL, expires_at INTEGER NOT NULL, used_at INTEGER)`,
 		`CREATE TABLE IF NOT EXISTS agents (id TEXT PRIMARY KEY, name TEXT NOT NULL, vmid INTEGER NOT NULL DEFAULT 0, hostname TEXT NOT NULL DEFAULT '', machine_id TEXT NOT NULL DEFAULT '', secret_hash TEXT NOT NULL, enrolled_at INTEGER NOT NULL, last_seen INTEGER NOT NULL, version TEXT NOT NULL DEFAULT '', report_json TEXT NOT NULL DEFAULT '{}', remote_address TEXT NOT NULL DEFAULT '')`,
+		`CREATE TABLE IF NOT EXISTS agent_actions (id INTEGER PRIMARY KEY AUTOINCREMENT, agent_id TEXT NOT NULL, action TEXT NOT NULL, target TEXT NOT NULL DEFAULT '', requested_at INTEGER NOT NULL, started_at INTEGER, completed_at INTEGER, status TEXT NOT NULL DEFAULT 'queued', result TEXT NOT NULL DEFAULT '', FOREIGN KEY(agent_id) REFERENCES agents(id) ON DELETE CASCADE)`,
+		`CREATE INDEX IF NOT EXISTS agent_actions_agent_status_idx ON agent_actions(agent_id,status)`,
+		`CREATE TABLE IF NOT EXISTS service_links (service_id INTEGER PRIMARY KEY, agent_id TEXT NOT NULL DEFAULT '', vmid INTEGER NOT NULL DEFAULT 0, component_type TEXT NOT NULL DEFAULT '', component_name TEXT NOT NULL DEFAULT '', port INTEGER NOT NULL DEFAULT 0, FOREIGN KEY(service_id) REFERENCES services(id) ON DELETE CASCADE)`,
 	}
 	for _, statement := range statements {
 		if _, err := db.Exec(statement); err != nil {