MongoDB Atlas has released a new feature called Performance Advisor, which uses the `mongocli` tool to analyze logs and recommend indexes to improve query performance. The `mongocli atlas performanceAdvisor suggestedIndexes ls` command scans logs and returns recommended indexes, which can be used to optimize database queries. To automate this process, users can write scripts using `mongocli` to create all recommended indexes. This feature is part of the larger `mongocli` tool, which brings MongoDB cloud infrastructure management to the terminal.