Lambda Functions must have an associated tag

Tags are key-value pairs that you attach to AWS resources to better organize them. They are particularly useful when you have many resources of the same type, which in the case of AWS Lambda, is a function. By using tags, customers with hundreds of Lambda functions can easily access and analyze a specific set by filtering on those that contain the same tag. Two of the key advantages of tagging your Lambda functions are: Grouping and Filtering and Cost allocation.