Core gates

Purpose

The core "gates" provide a way to ensure that changes to core meet our standards.

The gates should be a well-documented resource for developers, reviewers and committers.

The gates should provide a checklist used by developers, reviewers and committers to evaluate the readiness of a change.

Developers can use the gates to write gate-satisfying code and reviewers can use them to check for gate satisfaction. For each gate, focus on only the most important items (limit to 5 or fewer).

Each gate should not add additional burden to the respective team. 

For background, the gates were initially identified during Dries Buytaert's keynote at DrupalCon Chicago.