How can we check when each Lambda function in AWS was last used

Hello.

A surefire way is to open CloudWatch Logs from Monitoring and check the latest execution times.
As far as I know, you can probably only do this on the management console by checking the monitoring or checking the logs.

Hi,

I'd suggest you to go this post: https://stackoverflow.com/questions/73887032/get-last-execution-date-for-more-than-100-lambdas

It provides some Python code to obtain the last execution time that you're after.

I would suggest to replace the text files with the list of functions names by a call to https://boto3.amazonaws.com/v1/documentation/api/latest/reference/services/lambda/client/list_functions.html

Best,

Didier