Automation of Repetitive Operational Tasks in a Cloud Environment

To improve efficiency and reduce manual intervention, I aim to automate routine operational tasks within a cloud environment (AWS). Our existing infrastructure primarily uses Ubuntu 20.04 servers and our technology stack includes Docker, Kubernetes, and PostgreSQL. Could you assist in:

1. Identifying high-impact tasks suitable for automation within this environment (e.g., log rotation, system health checks, application deployments, database backups).
2. Recommending automation tools (e.g., Ansible, Terraform, AWS CLI, Python scripting with boto3) and scripting languages (e.g., Python, Bash) for implementation, considering our existing technology stack.
3. Providing sample scripts or playbooks for automating these tasks, focusing on practical examples applicable to AWS and Ubuntu 20.04.
4. Defining the scope of system health checks to include CPU utilization, memory usage, disk I/O, network latency, and the status of key services (Docker, Kubernetes).
5. Clarifying our performance requirements. We aim for automated tasks to execute within a reasonable timeframe (e.g., log rotation should complete within 5 minutes, system health checks within 1 minute) and minimize resource utilization to avoid impacting application performance. Please suggest strategies for optimizing task execution time and resource consumption.

Please present the information in a tabular format, detailing tasks, tools, example scripts/playbooks, and estimated execution times/resource usage.