#cloudformation

DevOps & CI/CD Bug Report

CI pipeline red on "No changes to deploy": sam deploy, empty changesets and environment config

Tomás Herrera · Oct 7, 2026 · 7 min read

Our GitHub Actions pipeline for a serverless API failed every time a merge did not change the stack, such as documentation-only commits: Error: No changes to deploy. How CloudFormation empty changesets work, the flag that makes sam deploy exit cleanly, and the samconfig and OIDC setup we use per environment.

Cloud & Infrastructure Bug Report

SQS messages processed twice: visibility timeout shorter than the Lambda timeout

John Nguyen · Sep 6, 2026 · 9 min read

After we raised a Lambda timeout to handle large PDFs, customers started getting the same invoice email twice. The SQS queue's visibility timeout was still 60 seconds, so slow messages reappeared and a second invocation picked them up mid-processing.