What methods of system status verification do you know during deployment?

When deploying a system, it is important to check its status to ensure a successful update and the absence of failures. Key verification methods:

• Service status check. Using system commands (systemctl status, docker ps) or orchestrators (Kubernetes kubectl get pods) to monitor running components.
• Logs. Analyzing application logs and system logs for errors or warnings.
• Monitoring and alerts. Using monitoring tools (Prometheus, Grafana) to track metrics and receive timely notifications about issues.
• Smoke tests. Running simple automated tests that verify the main functions of the application.
• Availability check. Using HTTP requests or pings to verify service availability.

For example, after deploying a web application, you can check that the service is running, the HTTP response returns 200 OK, and there are no errors in the logs.