Log insights allow us to search and analyze CloudWatch logs. Log insights include a built-in query language with a simple set of commands. We can use log insights to identify the root cause of issues and even validate deployed fixes. 

Log insights can automatically discover fields in logs from AWS services such as Route 53, Lambda, CloudTrail, VPC, and so on, even for a custom log that emits log events in JSON. Log insights can only be used to search log data that was sent to CloudWatch Logs on or after November 5, 2018.