Terraform modules as a product
Treating internal modules with the same rigour as external libraries: semantic versioning, contracts, deprecation paths and golden-path testing.
If your internal Terraform modules don't have a CHANGELOG, they aren't modules — they're shared mutation surfaces. The fix is to treat them as a product with users, a roadmap and a support contract.
Versioning is a contract
Tag releases. Use semantic versioning. Pin consumers. A breaking change in a v1 module that surprises three teams on a Friday is a leadership failure, not a Terraform failure.
Test the golden path
Every module should have a Terratest or terraform-test scenario that builds the canonical example end-to-end. If the example breaks, the release is blocked. Nothing else gives the same confidence.
Deprecate, don't delete
Mark old inputs as deprecated, emit a warning, leave them working for a release or two, then remove. Consumers get time to migrate. This is the difference between a platform team and a chaos team.
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