GCP Associate Cloud Engineer Practice Question

A DevOps engineer must quickly find only the startup-script failures for Compute Engine VMs whose names start with "web-prod" and that run in zone us-central1-a. Which Logs Explorer advanced filter will return exactly those log entries and nothing else?

logName="projects/myproj/logs/compute.googleapis.com%2Fserial_port1" resource.labels.zone="us-central1-a" severity=ERROR textPayload:"startup-script"
resource.type="gce_instance" resource.labels.zone="us-central1-*" severity>=ERROR textPayload:("startup-script") NOT resource.labels.instance_name:"web-prod"
resource.type="gce_instance" resource.labels.zone="us-central1-a" resource.labels.instance_name:"web-prod" severity=ERROR textPayload:"startup-script"
resource.type="gce_instance" resource.labels.zone="us-central1-a" resource.labels.instance_name:"web-prod" severity=INFO textPayload:"startup-script"

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Answer Description

The filter must combine all four required conditions:

resource.type must be gce_instance so that only VM-related logs are queried.
resource.labels.zone must equal us-central1-a to limit results to that zone.
resource.labels.instance_name:"web-prod" uses the substring operator (:) to match any VM whose name begins with web-prod.
severity=ERROR ensures only failures are returned.
textPayload:"startup-script" restricts results to messages that contain the startup-script text.

The correct option includes every condition with precise equality or substring operators. The distractors each omit or mis-specify at least one requirement: one lacks the instance name filter, another uses severity=INFO, and another widens the zone and excludes the desired VMs while using a range (>=ERROR) that would still include non-critical logs.

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