What's changed: Created Professional Cloud Developer Chapter 6 (Domain 4 "Integration" part 2: observability = Google Cloud Observability/metrics (Monitoring)/logs (Logging)/traces (Trace)/trace-ID correlation/Gemini Cloud Assist; troubleshooting = Error Reporting aggregation, isolate metrics→traces→logs, fix/rollback).
6.2Troubleshooting and error handling
Understand aggregating and managing application errors with Error Reporting, identifying and resolving issues with Google Cloud Observability, the debugging workflow, and addressing latency and error-rate problems.
Using observed data, developers quickly identify and fix issues. Aggregating errors and debugging systematically shrinks mean time to recovery.
6.2.1Aggregating and managing errors
When many errors share a cause, scanning logs buries them. Error Reporting automatically aggregates and groups application errors, surfacing frequency and new occurrences with notifications. This lets you prioritize high-impact errors. Map "aggregate scattered errors and prioritize = Error Reporting."
6.2.2Identifying and resolving issues
Isolate issues systematically: use metrics to see where it is abnormal (rising latency/error rate), traces to find which service is slow/failing, and logs to confirm why in detail. Determine whether it is an infrastructure, CI/CD, application, observability, or performance layer issue, then fix and deploy (rollback if needed). Map "isolate in order metrics→traces→logs" and "high-impact first = prioritize via Error Reporting."
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