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Find AWS Lambda Functions Executed in a Specific Time Range Using Boto3 and CloudWatch Logs


At times, we need to identify which Lambda functions were executed within a specific time range, primarily for troubleshooting or monitoring purposes.

In this blog, I'll share a Python Boto3 script that allows you to search and discover which Lambda functions have execution results in their CloudWatch logs.

(Note: You can also use CloudWatch Logs Insights to query the logs. If the number of target log groups is smaller than the maximum limit of 50, using Logs Insights on the Console might be more convenient.)


Example results

This is the example of the results. I've found that the Lambda function test-my2 was executed twice (2 events) between 2023-04-30 20:10:00+09:00 and 2023-04-30 21:10:00+09:00.

Start. 2023-04-30 21:20:37
From 2023-04-30 20:10:00+09:00
To 2023-04-30 21:10:00+09:00
Check 65 log groups... wait...
2 events
Finished.  2023-04-30 21:21:17
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You can also use logGroupNamePattern instead of logGroupNamePrefix. (These are mutually exclusive. ) Note that boto3 version after 1.26.17 is required.

Refer to the boto3 document.

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