Merge pull request 'swagger' (#37) from swagger into rc

Reviewed-on: http://git.enode/deployer3000/trust-module-backend/pulls/37
Reviewed-by: Vladislav Drozdov <ya2@ya.ru>

.env

@@ -1,7 +1,7 @@
 # Прометеус
 PROMETHEUS_API=http://192.168.2.34:9090/api/v1
 
-FRONTEND_URL=localhost:5173
+FRONTEND_URL=http://localhost:5173
 
 # Постгресс 
 DB_HOST=192.168.2.37

package-lock.json

@@ -36,7 +36,8 @@
         "reflect-metadata": "^0.2.2",
         "rxjs": "^7.8.1",
         "socket.io": "^4.8.1",
-        "typeorm": "^0.3.21"
+        "typeorm": "^0.3.21",
+        "ws": "^8.18.3"
       },
       "devDependencies": {
         "@eslint/eslintrc": "^3.2.0",
@@ -5956,6 +5957,27 @@
         "node": ">= 0.6"
       }
     },
+    "node_modules/engine.io/node_modules/ws": {
+      "version": "8.17.1",
+      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.17.1.tgz",
+      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/enhanced-resolve": {
       "version": "5.18.1",
       "resolved": "https://registry.npmjs.org/enhanced-resolve/-/enhanced-resolve-5.18.1.tgz",
@@ -10984,6 +11006,27 @@
         }
       }
     },
+    "node_modules/socket.io-adapter/node_modules/ws": {
+      "version": "8.17.1",
+      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.17.1.tgz",
+      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "license": "MIT",
+      "engines": {
+        "node": ">=10.0.0"
+      },
+      "peerDependencies": {
+        "bufferutil": "^4.0.1",
+        "utf-8-validate": ">=5.0.2"
+      },
+      "peerDependenciesMeta": {
+        "bufferutil": {
+          "optional": true
+        },
+        "utf-8-validate": {
+          "optional": true
+        }
+      }
+    },
     "node_modules/socket.io-parser": {
       "version": "4.2.4",
       "resolved": "https://registry.npmmirror.com/socket.io-parser/-/socket.io-parser-4.2.4.tgz",
@@ -12918,9 +12961,9 @@
       "license": "ISC"
     },
     "node_modules/ws": {
-      "version": "8.17.1",
-      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.17.1.tgz",
-      "integrity": "sha512-6XQFvXTkbfUOZOKKILFG1PDK2NDQs4azKQl26T0YS5CxqWLgXajbPZ+h4gZekJyRqFU8pvnbAbbs/3TgRPy+GQ==",
+      "version": "8.18.3",
+      "resolved": "https://registry.npmmirror.com/ws/-/ws-8.18.3.tgz",
+      "integrity": "sha512-PEIGCY5tSlUt50cqyMXfCzX+oOPqN0vuGqWzbcJ2xvnkzkq46oOpz7dQaTDBdfICb4N14+GARUDw2XV2N4tvzg==",
       "license": "MIT",
       "engines": {
         "node": ">=10.0.0"

package.json

@@ -20,34 +20,35 @@
     "test:e2e": "jest --config ./test/jest-e2e.json"
   },
   "dependencies": {
+    "@clickhouse/client": "^1.11.2",
+    "@clickhouse/client-web": "^1.11.2",
     "@nestjs/axios": "^4.0.0",
     "@nestjs/common": "^11.0.1",
-    "@nestjs/core": "^11.0.1",
     "@nestjs/config": "^4.0.0",
-    "@nestjs/platform-express": "^11.0.1",
-    "axios": "^1.7.9",
-    "reflect-metadata": "^0.2.2",
-    "dotenv": "^16.3.1",
-    "rxjs": "^7.8.1",
-    "@nestjs/typeorm": "^11.0.0",
-    "pg": "^8.14.1",
-    "typeorm": "^0.3.21",
-    "bcrypt": "^5.1.1",
-    "@types/bcrypt": "^5.0.2",
-    "socket.io": "^4.8.1",
-    "@nestjs/websockets": "11.0.12",
-    "@nestjs/platform-socket.io": "11.0.12",
-    "passport": "^0.7.0",
-    "passport-jwt": "^4.0.1",
-    "cookie-parser": "^1.4.7",
-    "@types/passport-jwt": "^4.0.1",
-    "@types/cookie-parser": "^1.4.8",
+    "@nestjs/core": "^11.0.1",
     "@nestjs/jwt": "^11.0.0",
     "@nestjs/passport": "^11.0.5",
+    "@nestjs/platform-express": "^11.0.1",
+    "@nestjs/platform-socket.io": "11.0.12",
     "@nestjs/swagger": "11.1.4",
-    "@clickhouse/client": "^1.11.2",
+    "@nestjs/typeorm": "^11.0.0",
+    "@nestjs/websockets": "11.0.12",
+    "@types/bcrypt": "^5.0.2",
+    "@types/cookie-parser": "^1.4.8",
+    "@types/passport-jwt": "^4.0.1",
+    "axios": "^1.7.9",
+    "bcrypt": "^5.1.1",
+    "cookie-parser": "^1.4.7",
     "date-fns": "4.1.0",
-    "@clickhouse/client-web": "^1.11.2"
+    "dotenv": "^16.3.1",
+    "passport": "^0.7.0",
+    "passport-jwt": "^4.0.1",
+    "pg": "^8.14.1",
+    "reflect-metadata": "^0.2.2",
+    "rxjs": "^7.8.1",
+    "socket.io": "^4.8.1",
+    "typeorm": "^0.3.21",
+    "ws": "^8.18.3"
   },
   "devDependencies": {
     "@eslint/eslintrc": "^3.2.0",

src/prometheus/metrics.gateway.ts

@@ -1,253 +1,391 @@
-import {
-    WebSocketGateway,
-    WebSocketServer,
-    OnGatewayInit,
-    OnGatewayConnection,
-    OnGatewayDisconnect,
-    SubscribeMessage,
-} from '@nestjs/websockets';
-import { Server, Socket } from 'socket.io';
+import { Injectable, Logger, OnModuleInit } from '@nestjs/common';
+import { Server, WebSocket } from 'ws';
+import { createServer } from 'http';
 import { PrometheusService } from './prometheus.service';
-import { Logger } from '@nestjs/common';
+import { ConfigService } from '@nestjs/config';
 
-@WebSocketGateway({
-    cors: {
-        origin: process.env.FRONTEND_URL,
-        methods: ['GET', 'POST'],
-        credentials: true
-    },
-    namespace: '/api/metrics-ws'
-})
-export class MetricsGateway implements OnGatewayInit, OnGatewayConnection, OnGatewayDisconnect {
-    @WebSocketServer() server: Server;
+type Filters = Record<string, string>;
+
+@Injectable()
+export class MetricsGateway implements OnModuleInit {
     private readonly logger = new Logger(MetricsGateway.name);
-    private activeSockets: Map<string, Socket> = new Map();
-    private metricSubscriptions = new Map<string, {
-        stopUpdates: () => void;
-        clients: Set<string>;
-    }>();
-    private lastSentData = new Map<string, any>(); // Кэш последних отправленных данных
+    private wss: Server;
 
-    constructor(private readonly prometheusService: PrometheusService) { }
+    private activeSockets = new Map<string, WebSocket>();
+    private metricSubscriptions = new Map<
+        string,
+        { stopUpdates: () => void; clients: Set<string> }
+    >();
 
-    afterInit(server: Server) {
-        this.logger.log('WebSocket Gateway initialized');
+    private lastSentData = new Map<string, any>();
+
+    constructor(
+        private readonly prometheusService: PrometheusService,
+        private readonly configService: ConfigService
+    ) { }
+
+    onModuleInit() {
+        const httpServer = createServer();
+        this.wss = new Server({
+            server: httpServer,
+            path: '/metrics-ws',
+        });
+
+        this.wss.on('connection', (client, request) =>
+            this.handleConnection(client, request)
+        );
+        this.wss.on('error', (err) =>
+            this.logger.error('WebSocket server error:', err)
+        );
+
+        const wsPort = Number(this.configService.get('WS_PORT') || 3001);
+        httpServer.listen(wsPort, () => {
+            this.logger.log(
+                `WebSocket server running at ws://localhost:${wsPort}/api/metrics-ws`
+            );
+        });
     }
 
-    handleConnection(client: Socket) {
-        this.logger.log(`Client connected: ${client.id}`);
-        this.activeSockets.set(client.id, client);
+
+    private handleConnection(client: WebSocket, request: any) {
+        let clientId =
+            this.getQueryParams(request?.url).clientId ||
+            Math.random().toString(36).slice(2);
+
+        this.activeSockets.set(clientId, client);
+        this.logger.log(`Client connected: ${clientId}`);
+
+        client.on('message', (raw) => {
+            try {
+                const msg = JSON.parse(raw.toString());
+                this.handleMessage(clientId, client, msg);
+            } catch (err) {
+                this.sendError(client, 'Invalid JSON');
+            }
+        });
+
+        client.on('close', () => this.cleanupClient(clientId));
+        client.on('error', (err) => {
+            this.logger.error(`Client ${clientId} error:`, err);
+            this.cleanupClient(clientId);
+        });
     }
 
-    handleDisconnect(client: Socket) {
-        this.logger.log(`Client disconnected: ${client.id}`);
-        this.activeSockets.delete(client.id);
+    private handleMessage(clientId: string, client: WebSocket, message: any) {
+        const { event, data } = message || {};
+        if (!event) return this.sendError(client, 'Event type is required');
 
-        // Очистка всех подписок этого клиента
-        for (const [metric, subscription] of this.metricSubscriptions) {
-            subscription.clients.delete(client.id);
-            if (subscription.clients.size === 0) {
-                subscription.stopUpdates();
-                this.metricSubscriptions.delete(metric);
-                this.lastSentData.delete(metric);
+        switch (event) {
+            case 'unsubscribe-all':
+                return this.unsubscribeAllForClient(clientId);
+
+            case 'get-metrics':
+                return this.handleGetMetrics(client, data);
+
+            case 'subscribe-metric':
+                return this.handleSubscribeMetric(clientId, client, data);
+
+            case 'unsubscribe-metric':
+                return this.handleUnsubscribeMetric(clientId, data);
+
+            default:
+                return this.sendError(client, `Unknown event type: ${event}`);
+        }
+    }
+
+    private cleanupClient(clientId: string) {
+        if (!this.activeSockets.has(clientId)) return;
+        this.logger.log(`Client disconnected: ${clientId}`);
+        this.activeSockets.delete(clientId);
+
+        setTimeout(() => {
+            if (!this.activeSockets.has(clientId)) {
+            }
+        }, 5000);
+
+        for (const [key, sub] of this.metricSubscriptions) {
+            sub.clients.delete(clientId);
+            if (sub.clients.size === 0) {
+                sub.stopUpdates();
+                this.metricSubscriptions.delete(key);
+                this.lastSentData.delete(key);
             }
         }
     }
 
-    @SubscribeMessage('unsubscribe-all')
-    handleUnsubscribeAll(client: Socket) {
-        for (const [metric, subscription] of this.metricSubscriptions) {
-            subscription.clients.delete(client.id);
-            if (subscription.clients.size === 0) {
-                subscription.stopUpdates();
-                this.metricSubscriptions.delete(metric);
-                this.lastSentData.delete(metric);
+    private unsubscribeAllForClient(clientId: string) {
+        for (const [key, sub] of this.metricSubscriptions) {
+            if (sub.clients.has(clientId)) sub.clients.delete(clientId);
+            if (sub.clients.size === 0) {
+                sub.stopUpdates();
+                this.metricSubscriptions.delete(key);
+                this.lastSentData.delete(key);
             }
         }
     }
 
-    @SubscribeMessage('get-metrics')
-    async handleGetMetrics(client: Socket, payload: any) {
-        const { metric, start, end, step, isRangeQuery, requestId, filters = {} } = payload;
+
+    private async handleGetMetrics(client: WebSocket, payload: any) {
+        const {
+            metric,
+            start,
+            end,
+            step,
+            isRangeQuery,
+            requestId,
+            filters = {},
+        } = payload || {};
 
         if (!metric) {
-            client.emit('metrics-error', {
-                error: 'Metric name is required',
-                requestId
-            });
-            return;
+            return this.sendError(client, 'Metric name is required', requestId);
         }
 
         if (isRangeQuery) {
             try {
-                const data = await this.prometheusService.fetchMetricsRange(metric, start, end, step, filters);
-                client.emit('metrics-data', { metric, data, requestId });
-                return;
-            } catch (error) {
-                client.emit('metrics-error', {
-                    error: error.message,
-                    requestId
-                });
-                return;
-            }
-        }
-
-        try {
-            const subscriptionKey = this.getSubscriptionKey(metric, filters);
-            // Отправляем текущие данные сразу при запросе
-            const initialData = await this.prometheusService.fetchMetricsWithFilters(metric, filters);
-            client.emit('metrics-data', { metric, data: initialData, requestId });
-            this.lastSentData.set(subscriptionKey, initialData);
-
-            const stopUpdates = await this.sendPeriodicUpdates(
+                const rangeData = await this.prometheusService.fetchMetricsRange(
                     metric,
-                step || 5000,
-                (data) => {
-                    const lastData = this.lastSentData.get(subscriptionKey);
-                    if (!this.isDataEqual(lastData, data)) {
-                        client.emit('metrics-data', { metric, data, requestId });
-                        this.lastSentData.set(subscriptionKey, data);
-                    }
-                },
+                    start,
+                    end,
+                    step,
                     filters
                 );
+                this.logger.debug('RangeQuery result', JSON.stringify(rangeData).slice(0, 200));
 
-            const cleanup = () => {
-                stopUpdates();
-                this.lastSentData.delete(subscriptionKey);
-                client.off('disconnect', cleanup);
-                client.off('unsubscribe-metric', cleanup);
-            };
-
-            client.on('disconnect', cleanup);
-            client.on('unsubscribe-metric', cleanup);
-
-        } catch (error) {
-            client.emit('metrics-error', {
-                error: error.message,
-                requestId
+                return this.sendMessage(client, {
+                    event: 'metrics-data',
+                    data: rangeData,
+                    metric,
+                    requestId,
                 });
+            } catch (err: any) {
+                return this.sendError(client, err?.message || 'Range query error', requestId);
             }
         }
 
-    private getSubscriptionKey(metric: string, filters: Record<string, string>): string {
-        const filterKeys = Object.keys(filters).sort();
-        const filterString = filterKeys.map(k => `${k}=${encodeURIComponent(filters[k])}`).join('&');
-        return `${metric}${filterString ? `?${filterString}` : ''}`;
-    }
-
-    // Сравниваем данные, чтобы избежать лишних отправок
-    private isDataEqual(oldData: any[], newData: any[]): boolean {
-        if (!oldData || !newData || oldData.length !== newData.length) return false;
-        
-        return oldData.every((oldItem, index) => {
-            const newItem = newData[index];
-            return (
-                oldItem.value === newItem.value &&
-                oldItem.status === newItem.status &&
-                oldItem.timestamp === newItem.timestamp
-            );
-        });
-    }
-
-    @SubscribeMessage('subscribe-metric')
-    async handleSubscribeMetric(
-        client: Socket,
-        payload: {
-            metric: string;
-            interval?: number;
-            filters?: Record<string, string>;
-        }
-    ) {
-        const { metric, interval = 60000, filters = {} } = payload; // По умолчанию 60 секунд
+        try {
             const subscriptionKey = this.getSubscriptionKey(metric, filters);
 
-        if (!this.metricSubscriptions.has(subscriptionKey)) {
-            // Отправляем текущие данные сразу при подписке
-            try {
-                const initialData = await this.prometheusService.fetchMetricsWithFilters(metric, filters);
-                client.emit('metrics-data', {
-                    metric: subscriptionKey,
-                    data: initialData
+            const initialData =
+                await this.prometheusService.fetchMetricsWithFilters(metric, filters);
+
+            this.sendMessage(client, {
+                event: 'metrics-data',
+                data: { metric, data: initialData, requestId },
             });
-                this.lastSentData.set(subscriptionKey, initialData);
-            } catch (error) {
-                this.logger.error(`Error fetching initial data for ${metric}:`, error.message);
+
+            let lastLocal = initialData;
+
+            const jitter = Math.floor(Math.random() * 5000);
+            setTimeout(() => {
+                const timer = setInterval(async () => {
+                    try {
+                        const fresh =
+                            await this.prometheusService.fetchMetricsWithFilters(
+                                metric,
+                                filters
+                            );
+                        if (!this.isDataEqual(lastLocal, fresh)) {
+                            this.sendMessage(client, {
+                                event: 'metrics-data',
+                                data: { metric, data: fresh, requestId },
+                            });
+                            lastLocal = fresh;
                         }
+                    } catch (e) {
+                        this.logger.error(
+                            `Error in on-demand periodic update for ${subscriptionKey}:`,
+                            (e as any)?.message
+                        );
+                    }
+                }, step || 5000);
+
+                const closeOnce = () => clearInterval(timer);
+                client.once('close', closeOnce);
+                client.once('error', closeOnce);
+            }, jitter);
+        } catch (err: any) {
+            return this.sendError(client, err?.message || 'get-metrics error', requestId);
+        }
+    }
+
+    private async handleSubscribeMetric(clientId: string, client: WebSocket, payload: any) {
+        const { metric, interval = 60000, filters = {} } = payload || {};
+        if (!metric) {
+            this.sendError(client, 'Metric name is required');
+            return;
+        }
+
+        const key = this.getSubscriptionKey(metric, filters);
+
+        try {
+            const initial = await this.prometheusService.fetchMetricsWithFilters(metric, filters);
+
+            if (!Array.isArray(initial)) {
+                throw new Error(`Expected array for metric ${metric}, got ${typeof initial}`);
+            }
+
+            this.sendMessage(client, {
+                event: 'metrics-data',
+                data: {
+                    metric: key,
+                    data: initial,
+                    type: 'initial'
+                }
+            });
+
+            this.lastSentData.set(key, initial);
 
             const stopUpdates = await this.sendPeriodicUpdates(
                 metric,
                 interval,
-                (data) => {
-                    // Отправляем только если данные изменились
-                    const lastData = this.lastSentData.get(subscriptionKey);
-                    if (!this.isDataEqual(lastData, data)) {
-                        this.server.emit('metrics-data', {
-                            metric: subscriptionKey,
-                            data
+                (freshData) => {
+                    if (!Array.isArray(freshData)) {
+                        this.logger.error(`Periodic update: expected array for ${key}, got ${typeof freshData}`);
+                        return;
+                    }
+
+                    const lastData = this.lastSentData.get(key);
+                    if (!this.isDataEqual(lastData, freshData)) {
+                        this.broadcast({
+                            event: 'metrics-data',
+                            data: {
+                                metric: key,
+                                data: freshData,
+                                type: 'update'
+                            }
                         });
-                        this.lastSentData.set(subscriptionKey, data);
+                        this.lastSentData.set(key, freshData);
                     }
                 },
                 filters
             );
 
-            this.metricSubscriptions.set(subscriptionKey, {
+            this.metricSubscriptions.set(key, {
                 stopUpdates,
-                clients: new Set([client.id])
+                clients: new Set([clientId]),
             });
-        } else {
-            this.metricSubscriptions.get(subscriptionKey)?.clients.add(client.id);
-            // Отправляем кэшированные данные новому клиенту
-            const cachedData = this.lastSentData.get(subscriptionKey);
-            if (cachedData) {
-                client.emit('metrics-data', {
-                    metric: subscriptionKey,
-                    data: cachedData
-                });
-            }
-        }
 
             const unsubscribe = () => {
-            const subscription = this.metricSubscriptions.get(subscriptionKey);
+                this.logger.log(`Unsubscribing client ${clientId} from ${key}`);
+                const subscription = this.metricSubscriptions.get(key);
                 if (subscription) {
-                subscription.clients.delete(client.id);
+                    subscription.clients.delete(clientId);
                     if (subscription.clients.size === 0) {
                         subscription.stopUpdates();
-                    this.metricSubscriptions.delete(subscriptionKey);
-                    this.lastSentData.delete(subscriptionKey);
+                        this.metricSubscriptions.delete(key);
+                        this.lastSentData.delete(key);
                     }
                 }
             };
 
-        client.on('disconnect', unsubscribe);
-        client.on('unsubscribe-metric', unsubscribe);
+            client.on('close', unsubscribe);
+            client.on('error', unsubscribe);
+
+        } catch (error) {
+            this.logger.error(`Subscription error for ${key}:`, error);
+            this.sendError(client, error.message);
+
+            if (!this.metricSubscriptions.has(key)) {
+                this.lastSentData.delete(key);
+            }
+        }
     }
 
-    async sendPeriodicUpdates(
+    private handleUnsubscribeMetric(
+        clientId: string,
+        payload: { metric: string; filters?: Filters }
+    ) {
+        const { metric, filters = {} } = payload || {};
+        if (!metric) return;
+
+        const key = this.getSubscriptionKey(metric, filters);
+        const sub = this.metricSubscriptions.get(key);
+        if (!sub) return;
+
+        sub.clients.delete(clientId);
+        if (sub.clients.size === 0) {
+            sub.stopUpdates();
+            this.metricSubscriptions.delete(key);
+            this.lastSentData.delete(key);
+        }
+    }
+
+
+    private getQueryParams(rawUrl?: string): Record<string, string> {
+        try {
+            const url = new URL(rawUrl || '', 'http://localhost'); // безопасная база
+            return Object.fromEntries(url.searchParams.entries());
+        } catch {
+            return {};
+        }
+    }
+
+    private getSubscriptionKey(metric: string, filters: Filters): string {
+        const keys = Object.keys(filters).sort();
+        const filterString = keys
+            .map((k) => `${k}=${encodeURIComponent(filters[k])}`)
+            .join('&');
+        return `${metric}${filterString ? `?${filterString}` : ''}`;
+    }
+
+    private isDataEqual(a: any[], b: any[]) {
+        if (!a || !b || a.length !== b.length) return false;
+        return a.every((item, i) => {
+            const x = b[i];
+            return (
+                item?.value === x?.value &&
+                item?.status === x?.status &&
+                item?.timestamp === x?.timestamp
+            );
+        });
+    }
+
+    private async sendPeriodicUpdates(
         metric: string,
         interval: number,
-        callback: (data: any) => void,
-        filters: Record<string, string> = {}
+        cb: (data: any) => void,
+        filters: Filters
     ) {
-        // Добавляем небольшую случайную задержку, чтобы избежать пиковой нагрузки
         const initialDelay = Math.floor(Math.random() * 5000);
-        
-        await new Promise(resolve => setTimeout(resolve, initialDelay));
+        await new Promise((r) => setTimeout(r, initialDelay));
 
         const timer = setInterval(async () => {
             try {
-                const data = await this.prometheusService.fetchMetricsWithFilters(metric, filters);
-                callback(data);
-            } catch (error) {
-                this.logger.error(`Error in periodic update for ${metric}:`, error.message);
+                const data = await this.prometheusService.fetchMetricsWithFilters(
+                    metric,
+                    filters
+                );
+                cb(data);
+            } catch (e: any) {
+                this.logger.error(
+                    `Error in periodic update for ${metric}:`,
+                    e?.message
+                );
             }
         }, interval);
 
-        return () => {
-            clearInterval(timer);
-            this.lastSentData.delete(this.getSubscriptionKey(metric, filters));
-            this.logger.log(`Stopped updates for ${metric}`);
-        };
+        return () => clearInterval(timer);
+    }
+
+    private sendMessage(client: WebSocket, message: any) {
+        if (client.readyState === WebSocket.OPEN) {
+            client.send(JSON.stringify(message));
         }
     }
+
+    private broadcast(message: any) {
+        const raw = JSON.stringify(message);
+        this.wss.clients.forEach((c) => {
+            if (c.readyState === WebSocket.OPEN) c.send(raw);
+        });
+    }
+
+    private sendError(client: WebSocket, error: string, requestId?: string) {
+        this.sendMessage(client, {
+            event: 'metrics-error',
+            data: { error, requestId },
+        });
+    }
+}
+
+