Oracle Cloud Infrastructure 2025 Observability Professional Advanced Practice Exam: Hard Questions 2025

A multi-AD production tenancy runs a latency-sensitive microservices platform on OKE. The operations team wants a dashboard showing p95 end-to-end latency per service and wants to correlate that with node CPU saturation. They already scrape application latency as a custom metric with labels (serviceName, route, pod). However, the dashboard queries are slow and often time out when aggregating p95 across many label combinations. What is the best architectural change to improve query performance while preserving the ability to drill down when needed?

You administer OCI Compute instances behind an OCI Load Balancer. An SRE team reports that the "Backend 5xx" metric spikes only when autoscaling adds instances. They suspect health checks are flapping during scale-out, but instance OS logs show nothing obvious. Which metrics-centric troubleshooting approach is most likely to identify whether health-check instability is causing the errors, without relying on application logs?

A security operations team wants to detect brute-force login attempts across multiple OCI services. They ingest audit logs and OS logs into Logging. They need to: (1) parse usernames/IPs, (2) enrich events with threat intel (a maintained list of IP ranges), and (3) create detections that can be operationalized with consistent fields across sources. What is the most appropriate OCI-native approach in the observability stack?

A large enterprise uses Logging Analytics for multiple teams. One team reports that a newly onboarded source is visible in Logging but not searchable in Logging Analytics, even though the log group is configured for ingestion. No errors appear in the console. What is the most likely cause and the best next step to validate it?

You are designing a centralized logging architecture for multiple compartments and teams. Requirements: teams must only access their own logs; the platform team needs cross-tenancy visibility for a shared service provider model; and you must ensure that log routing does not inadvertently expose sensitive data. Which design best satisfies least-privilege while enabling centralized analytics?

A production system uses metric-based alarms to detect error spikes. During an incident, engineers see high error rates in dashboards, but the alarm never triggered. Investigation shows the error metric is emitted with dimensions (service, pod, node). The alarm was created on the metric without specifying dimensions. What is the most accurate explanation and the best fix?

Your organization needs paging only when both conditions are true: (1) API availability drops below 99.5% over 10 minutes, and (2) p95 latency exceeds 800 ms over the same period. They also want a separate, non-paging ticket when either condition is true individually. What is the best alarm strategy to meet this requirement with minimal false positives?

A mission-critical notification pipeline uses OCI Notifications topics subscribed by HTTPS endpoints (an incident management system). During a major outage, alarm state changes occurred, but the incident system shows gaps. You must harden delivery and provide auditability for missed notifications without changing the incident system. Which solution is most appropriate?

An application instrumented with OCI APM shows intermittent latency spikes. Traces reveal slow database calls, but DB metrics look normal. You suspect connection pool exhaustion in only one of the microservices, causing queued requests. You need to confirm this using observability data and isolate whether the bottleneck is in-app, network, or database. Which approach is most effective?

After deploying a new release, users report increased errors only for a specific region and only for one mobile app version. APM shows higher exception rates in one service, but logs are too noisy to pinpoint the change. You want to rapidly isolate the regression by combining APM, logs, and dimensions such as region and appVersion. Which design enables the fastest, most precise triage in OCI observability?