Which Stackdriver features should they use to enable autoscaling notifications, admin error alerts, and cross-host log filtering?

The correct answer is Monitoring, Logging, Alerts, Error Reporting. Monitoring provides metrics and dashboards for observing system performance, which is foundational for understanding autoscaling behavior and setting up alerts. Logging collects and stores logs from applications and infrastructure, enabling cross-host log filtering to diagnose issues. Alerts (within Monitoring) allow you to define conditions based on metrics or logs that trigger notifications, such as for autoscaling events or critical errors. Error Reporting automatically aggregates and analyzes application errors, providing insights into admin errors without needing to manually sift through logs. Incorrect options include features like Trace (for distributed tracing) and Debug (for debugging code), which are not directly used for the specific requirements of autoscaling notifications, admin error alerts, and cross-host log filtering. Insights is not a distinct Stackdriver product.