RabbitMQ connection is not reused

Is there an existing issue for this?

[X] I have searched the existing issues

Current behavior

NestJS is creating a new connection and a new channel for each worker or client even if they are on the same server By my understanding this is a bad practice and you should reuse the connection and the channel Here is one of the references: 13 Common RabbitMQ Mistakes and How to Avoid Them

Minimum reproduction code

https://stackblitz.com/edit/nestjs-typescript-starter-udy3jt

Steps to reproduce

Download the code on a machine with RabbitMQ server with Management UI or any other way to check for connections and channels
Adjust the connections if necessary, inside main.ts and app.module.ts
npm ci
npm run start:dev
Call the server from browser like http://localhost:3000/ to trigger the clients to send messages
Check RabbitMQ management UI, you will find 3 connections and 3 channels created

Expected behavior

Only 1 or 2 connections and channels should be created

Package

[ ] I don't know. Or some 3rd-party package
[ ] code>@nestjs/common</code
[ ] code>@nestjs/core</code
[X] code>@nestjs/microservices</code
[ ] code>@nestjs/platform-express</code
[ ] code>@nestjs/platform-fastify</code
[ ] code>@nestjs/platform-socket.io</code
[ ] code>@nestjs/platform-ws</code
[ ] code>@nestjs/testing</code
[ ] code>@nestjs/websockets</code
[ ] Other (see below)

Other package

No response

NestJS version

8.7.7

Packages versions

"dependencies": {
    "@automapper/classes": "^8.7.7",
    "@automapper/core": "^8.7.7",
    "@automapper/nestjs": "^8.7.7",
    "@casl/ability": "^6.5.0",
    "@nestjs/common": "^9.4.2",
    "@nestjs/config": "^2.3.2",
    "@nestjs/core": "^9.4.2",
    "@nestjs/event-emitter": "^1.4.1",
    "@nestjs/microservices": "^9.4.2",
    "@nestjs/mongoose": "^9.2.2",
    "@nestjs/passport": "^9.0.3",
    "@nestjs/platform-express": "^9.4.2",
    "@nestjs/schedule": "^2.2.2",
    "@nestjs/swagger": "^6.3.0",
    "@nestjs/throttler": "^4.0.0",
    "amqp-connection-manager": "^4.1.13",
    "amqplib": "^0.10.3",
    "chalk": "^4.1.2",
    "class-transformer": "^0.5.1",
    "class-validator": "^0.14.0",
    "compression": "^1.7.4",
    "cookie-parser": "^1.4.6",
    "csrf-csrf": "^2.2.4",
    "file-type": "^16.5.4",
    "helmet": "^7.0.0",
    "joi": "^17.9.2",
    "lodash": "^4.17.21",
    "mongoose": "^7.2.2",
    "mongoose-autopopulate": "^1.0.1",
    "passport": "^0.6.0",
    "passport-http-bearer": "^1.0.1",
    "reflect-metadata": "^0.1.13",
    "rxjs": "^7.8.1",
    "uuid": "^9.0.0"
},
"devDependencies": {
    "@nestjs/cli": "^9.5.0",
    "@nestjs/schematics": "^9.2.0",
    "@nestjs/testing": "^9.4.2",
    "@types/amqplib": "^0.10.1",
    "@types/compression": "^1.7.2",
    "@types/cookie-parser": "^1.4.3",
    "@types/cron": "^2.0.1",
    "@types/express": "^4.17.17",
    "@types/jest": "^29.5.2",
    "@types/lodash": "^4.14.195",
    "@types/multer": "^1.4.7",
    "@types/node": "^18.16.16",
    "@types/passport": "^1.0.12",
    "@types/passport-http-bearer": "^1.0.37",
    "@types/supertest": "^2.0.12",
    "@types/uuid": "^9.0.1",
    "@typescript-eslint/eslint-plugin": "^5.59.9",
    "@typescript-eslint/parser": "^5.59.9",
    "eslint": "^8.42.0",
    "eslint-config-prettier": "^8.8.0",
    "husky": "^8.0.3",
    "jest": "^29.5.0",
    "lint-staged": "^13.2.2",
    "prettier": "^2.8.8",
    "sort-package-json": "^2.4.1",
    "source-map-support": "^0.5.21",
    "supertest": "^6.3.3",
    "ts-jest": "^29.1.0",
    "ts-loader": "^9.4.3",
    "ts-node": "^10.9.1",
    "tsconfig-paths": "^4.2.0",
    "typescript": "~5.0.4"
}

nestjs / nest

RabbitMQ connection is not reused #11702