Professional Cloud Architect

Cloud Storage Object Lifecycle Management can apply automatic Delete actions when objects meet specified conditions, including an age condition measured from each object’s creation time. A lifecycle rule therefore supports retention for the required period and automated deletion when that period ends.

Replacing batch FTP transfers with streaming transport makes telemetry available continuously rather than waiting for batch delivery. Using a binary format instead of CSV reduces transfer and processing overhead, while machine learning analysis can identify patterns that support faster, predictive parts decisions. Together, these changes directly reduce the aggregate-reporting delay that contributes to customer wait time for parts.

A global HTTP load balancer can distribute traffic across backend instance groups in multiple regions and automatically direct traffic to a healthy region when the primary region becomes unavailable. Using one Compute Engine instance group per region provides independent, scalable application backends for regional disaster recovery. The backend groups should be in the same project for the standard configuration.

Deployment Manager provides declarative automation for provisioning a repeatable recovery environment. Stackdriver—the former name for Google Cloud’s operations suite—provides integrated monitoring, logging, and debugging capabilities for observing and troubleshooting recovery tests. “Activity Logs” is not the corresponding GCP observability service.

The agent.googleapis.com/memory/percent_used metric is broken out by state (used, buffered, cached, slab, free) whose values sum to 100%. On Linux much RAM is reported as buffered/cached, so the strictly 'used' state can stay well below 80% even under heavy load, meaning a filter of state='used' with target 80 never triggers scaling. Filtering state='free' with a target of 20 correctly scales out when free memory drops below 20% (equivalent to total utilization exceeding 80%). Option C is invalid because a single metric label cannot equal several values simultaneously (the AND filter matches nothing), and DELTA_PER_MINUTE (A) is wrong for a gauge metric.