Dress4Win, a company that helps users manage their personal wardrobe through a web and mobile application, is planning to migrate to the cloud to handle the rapid growth of their application. They want to set up a managed logging and monitoring system to manage traffic spikes. The goals for this system are:

• The infrastructure should be able to scale up and down automatically to manage varying usage throughout the day.
• Administrators should receive automatic notifications when the application reports errors.
• It should be possible to filter aggregated logs to debug specific parts of the application across many hosts. Which Google StackDriver features should they use?