The issue log is a project document where the project manager records and tracks issues that can impact the project. In this case, the inability of the supplier to deliver the materials due to a large-scale labor problem is an issue that can impact the project. Therefore, the project manager should update the details of this issue in the issue log and communicate it to the relevant stakeholders. This will ensure that everyone is aware of the issue and can work together to find a solution. References: Project Management Professional (PMP) Examination Content Outline, June 2015, PMI; A Guide to the Project Management Body of Knowledge (PMBOKGuide) - Sixth Edition, Project Management Institute, Inc., 2017.