Final answer:
Rob can review deployment errors from a failed promotion by checking logs, error messages, documentation, and collaborating with the development and operations teams.
Step-by-step explanation:
When reviewing deployment errors from a failed promotion, Rob can start by checking the logs and error messages generated during the deployment process. This can provide valuable information about the specific errors that occurred and help identify the root cause. Rob can also review any documentation or release notes related to the deployment, as they may contain information about known issues or troubleshooting steps. Additionally, Rob can collaborate with the development and operations teams to gather more information and identify possible solutions to address the errors.