▸case-01 We are setting up Prometheus alerts for our connected vehicle telematics gateway handling MQTT traffic from 100,000 active VINs. High traffic spikes often trigger false alarms if evaluated instantly. Configure a Prometheus alerting rule named HighIngestionRate that fires when the incoming MQTT message rate exceeds 50,000 messages per second. What evaluation window should be specified in the 'for' clause to prevent transient network jitter from triggering alerts while catching sustained vehicle bursts? | pass→pass | 8,298 | 6,950 | -16% | 1 | 1 | 0% | 1,651 | 1,269 | -23% | 0 | 0 | — |
▸case-02 Our vehicle backend uses EMQX as the primary MQTT broker for vehicle telematics uplink. We need to monitor the total number of currently active vehicle client connections in Grafana. Which EMQX Prometheus metric name accurately tracks active client connections? | pass→pass | 5,531 | 4,603 | -17% | 1 | 1 | 0% | 997 | 829 | -17% | 0 | 0 | — |
▸case-03 We are defining an Alertmanager rule for Over-The-Air (OTA) firmware campaign deployment failures across fleet updates. If OTA installation HTTP responses yield 5xx errors, we need an alert to notify the SRE team on PagerDuty. What threshold percentage of total OTA requests failing over a 15-minute sliding window should trigger a Critical severity alert? | pass→pass | 12,007 | 9,888 | -18% | 1 | 1 | 0% | 2,284 | 1,824 | -20% | 0 | 0 | — |
▸case-04 Engineers want to add the dynamic Vehicle Identification Number (VIN) string directly as a Prometheus label on every high-frequency engine RPM metric metric reported by thousands of cars. Is adding high-cardinality vehicle VINs as direct Prometheus labels recommended for TSDB stability, and what alternative pattern should be used for per-vehicle lookup? | pass→pass | 16,047 | 12,374 | -23% | 1 | 1 | 0% | 2,918 | 2,453 | -16% | 0 | 0 | — |
▸case-05 CAN bus signal processing pipelines stream vehicle sensor payloads through Apache Kafka topics before ingestion into the cloud TSDB. Which Kafka consumer group metric should be continuously monitored to detect vehicle data processing delay? | pass→pass | 10,918 | 5,266 | -52% | 1 | 1 | 0% | 1,124 | 1,041 | -7% | 0 | 0 | — |
▸case-06 Vehicle-to-Cloud (V2X) safety telematics require strict response time tracking. Which percentile metric standard is best suited for measuring backend API tail latency for safety-critical vehicle requests? | fail→pass | 9,135 | 16,526 | +81% | 1 | 1 | 0% | 1,584 | 1,393 | -12% | 0 | 0 | — |
▸case-07 Our vehicle cloud backend converts SOME/IP vehicle network packets into gRPC for microservice routing. We need to alert when SOME/IP packet deserialization errors occur. What Prometheus metric type (Counter, Gauge, Histogram, or Summary) should be used to track deserialization drops? | pass→pass | 6,862 | 6,059 | -12% | 1 | 1 | 0% | 1,399 | 1,206 | -14% | 0 | 0 | — |
▸case-08 EV battery management backend services process high-voltage pack temperature telemetry. We want an alert rule that triggers when any connected vehicle reports a pack temperature exceeding 60 degrees Celsius. What PromQL query correctly filters telemetry metrics named vehicle_battery_temperature_celsius? | pass→pass | 4,389 | 3,044 | -31% | 1 | 1 | 0% | 831 | 502 | -40% | 0 | 0 | — |
▸case-09 Telematics units connect via private automotive APNs. We want to monitor sudden drop-offs in active vehicle socket sessions across cell carrier regions. Which aggregation operator in PromQL should be used to group active vehicle connections by carrier region? | pass→pass | 6,105 | 4,049 | -34% | 1 | 1 | 0% | 1,133 | 762 | -33% | 0 | 0 | — |
▸case-10 Remote vehicle diagnostics utilize Diagnostic over IP (DoIP). Backend DoIP gateways maintain TCP connections to vehicle gateways. What metric should be tracked to detect TCP connection leaks on the DoIP cloud gateway? | fail→fail | 12,586 | 8,346 | -34% | 1 | 1 | 0% | 2,111 | 1,406 | -33% | 0 | 0 | — |
▸case-11 AUTOSAR Adaptive Applications running on high-performance vehicle compute units stream diagnostic logs to Fluentbit on the cloud backend. What log level standard should be configured during normal operational monitoring to avoid overwhelming cloud ingress bandwidth? | pass→pass | 9,089 | 9,380 | +3% | 1 | 1 | 0% | 1,604 | 1,459 | -9% | 0 | 0 | — |
▸case-12 Vehicle location telemetry sends GPS coordinates every 5 seconds. To enable efficient geospatial queries in Elasticsearch without exceeding storage limits, what index mapping data type should be used for latitude/longitude points? | pass→pass | 7,833 | 5,233 | -33% | 1 | 1 | 0% | 1,366 | 973 | -29% | 0 | 0 | — |
▸case-13 The vehicle telematics ingress microservice scales horizontally on Kubernetes (EKS/GKE) using Horizontal Pod Autoscaler (HPA) during morning rush hour driver surges. What target CPU utilization percentage is standard for autoscaling ingress pods safely? | fail→fail | 12,078 | 10,977 | -9% | 1 | 1 | 0% | 2,263 | 2,041 | -10% | 0 | 0 | — |
▸case-14 Due to poor cellular coverage, vehicles resend MQTT QoS 1 messages leading to duplicate telemetry payloads. Which strategy should backend ingestion workers use to handle duplicate messages safely? | pass→pass | 12,596 | 10,284 | -18% | 1 | 1 | 0% | 2,224 | 1,781 | -20% | 0 | 0 | — |
▸case-15 On a live vehicle fleet operations dashboard displaying high-frequency telemetry, setting Grafana refresh rate too fast crashes the browser. What is the recommended minimum auto-refresh interval for production Grafana dashboards viewing live fleet metrics? | pass→pass | 9,996 | 15,552 | +56% | 1 | 1 | 0% | 2,004 | 1,031 | -49% | 0 | 0 | — |
▸case-16 Vehicle-to-Cloud mTLS connections rely on client certificates installed on vehicle hardware security modules (HSM). Which Prometheus exporter metric monitors upcoming TLS certificate expiration on cloud ingress proxies? | pass→pass | 6,883 | 6,509 | -5% | 1 | 1 | 0% | 1,424 | 1,563 | +10% | 0 | 0 | — |
▸case-17 Automotive regulatory compliance requires retaining security audit logs from cloud vehicle remote command endpoints (e.g., door unlock, remote engine start). What is the minimum recommended retention period in years for vehicle access security audit logs under ISO/SAE 21434 compliance frameworks? | pass→pass | 20,610 | 7,414 | -64% | 1 | 1 | 0% | 2,005 | 1,363 | -32% | 0 | 0 | — |
▸case-18 Vehicle cloud microservices communicate internally via gRPC. Which gRPC status code indicates server-side internal errors that should be counted toward system availability SLO error budgets? | pass→pass | 6,551 | 7,216 | +10% | 1 | 1 | 0% | 1,227 | 1,441 | +17% | 0 | 0 | — |
▸case-19 Malformed vehicle CAN signal payloads that fail JSON schema validation are routed to an AWS SQS Dead Letter Queue (DLQ). What alert condition should be set on the SQS ApproximateNumberOfMessagesVisible metric for the DLQ? | pass→pass | 11,902 | 5,372 | -55% | 1 | 1 | 0% | 1,985 | 1,043 | -47% | 0 | 0 | — |
▸case-20 When wiring a physical CAN bus network on an automotive ECU test bench, what resistance value in ohms is required for the termination resistors at both ends of the bus? | pass→pass | 3,897 | 3,049 | -22% | 1 | 1 | 0% | 600 | 539 | -10% | 0 | 0 | — |
▸case-21 What file format and root XML namespace standard is used when defining AUTOSAR classic system description ARXML files for ECU software composition? | pass→pass | 6,743 | 4,680 | -31% | 1 | 1 | 0% | 1,363 | 961 | -29% | 0 | 0 | — |
▸case-22 Which OBD-II Service 01 Parameter ID (PID) hex code is used to query engine coolant temperature directly from a vehicle engine control module via standard on-board diagnostics? | pass→pass | 2,401 | 2,296 | -4% | 1 | 1 | 0% | 439 | 492 | +12% | 0 | 0 | — |