Add monitoring module

Signed-off-by: David Mehren <git@herrmehren.de>

src/monitoring/monitoring.module.ts

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+import { Module } from '@nestjs/common';
+import { MonitoringService } from './monitoring.service';
+
+@Module({
+  providers: [MonitoringService],
+  exports: [MonitoringService],
+})
+export class MonitoringModule {}

src/monitoring/monitoring.service.spec.ts

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+import { Test, TestingModule } from '@nestjs/testing';
+import { MonitoringService } from './monitoring.service';
+
+describe('MonitoringService', () => {
+  let service: MonitoringService;
+
+  beforeEach(async () => {
+    const module: TestingModule = await Test.createTestingModule({
+      providers: [MonitoringService],
+    }).compile();
+
+    service = module.get<MonitoringService>(MonitoringService);
+  });
+
+  it('should be defined', () => {
+    expect(service).toBeDefined();
+  });
+});

src/monitoring/monitoring.service.ts

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+import { Injectable } from '@nestjs/common';
+import { ServerStatusDto } from './server-status.dto';
+
+@Injectable()
+export class MonitoringService {
+  getServerStatus(): ServerStatusDto {
+    return {
+      connectionSocketQueueLenght: 0,
+      destictOnlineUsers: 0,
+      disconnectSocketQueueLength: 0,
+      distictOnlineRegisteredUsers: 0,
+      isConnectionBusy: false,
+      isDisconnectBusy: false,
+      notesCount: 0,
+      onlineNotes: 0,
+      onlineRegisteredUsers: 0,
+      onlineUsers: 0,
+      registeredUsers: 0,
+      serverVersion: {
+        major: 2,
+        minor: 0,
+        patch: 0,
+        preRelease: 'dev',
+      },
+    };
+  }
+}

src/monitoring/server-status.dto.ts

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+export class ServerStatusDto {
+  serverVersion: {
+    major: number;
+    minor: number;
+    patch: number;
+    preRelease?: string;
+    commit?: string;
+  };
+  onlineNotes: number;
+  onlineUsers: number;
+  destictOnlineUsers: number;
+  notesCount: number;
+  registeredUsers: number;
+  onlineRegisteredUsers: number;
+  distictOnlineRegisteredUsers: number;
+  isConnectionBusy: boolean;
+  connectionSocketQueueLenght: number;
+  isDisconnectBusy: boolean;
+  disconnectSocketQueueLength: number;
+}