kubernetes

require "timeout"

module HealthCheck
  class Probe
    Result = Struct.new(:name, :status, :latency_ms, :critical, :error, keyword_init: true) do
      def healthy?

// Express app with health checks and graceful shutdown
const express = require('express');
const { createServer } = require('http');

const app = express();
const server = createServer(app);

apiVersion: v1
kind: ServiceAccount
metadata:
  name: metrics-reader
  namespace: production
---

# Headless Service for stable DNS
apiVersion: v1
kind: Service
metadata:
  name: postgres
  namespace: production

# === One-off Job: Database migration ===
apiVersion: batch/v1
kind: Job
metadata:
  name: db-migrate
  namespace: production

# ClusterIP Service (internal only)
apiVersion: v1
kind: Service
metadata:
  name: web-app
  namespace: production

apiVersion: networking.k8s.io/v1
kind: NetworkPolicy
metadata:
  name: api-ingress
  namespace: production
spec:

export type CheckResult = { name: string; status: 'up' | 'down'; durationMs: number; error?: string };
export type Check = () => Promise<void>;

function withTimeout(fn: Check, ms: number): Promise<void> {
  return new Promise((resolve, reject) => {
    const timer = setTimeout(() => reject(new Error(`timeout after ${ms}ms`)), ms);

# Service Account for the application
apiVersion: v1
kind: ServiceAccount
metadata:
  name: web-app-sa
  namespace: production

#!/bin/bash
# Helm commands

# Add repositories
helm repo add bitnami https://charts.bitnami.com/bitnami
helm repo update

package health

import (
  "context"
  "net"
  "net/http"

apiVersion: apps/v1
kind: Deployment
metadata:
  name: web-app
  namespace: production
  labels: