Explanation
According to the PMBOK Guide 7th Edition, an issue log is a tool for managing issues that arise during a project. It records the issue description, the owner, the status, the priority, and the resolution date. Updating the issue log with the status and priority of the technical impediment is the best action for the senior project manager to do now, as it helps to track the progress of the issue resolution and communicate it to the relevant stakeholders. Using interpersonal skills, sending a reminder, or issuing a warning are not sufficient actions to manage the issue effectively, as they do not provide a clear and documented record of the issue and its impact on the project. References: PMBOK Guide 7th Edition, page 215-216.