Explanation:
To limit the application to 5 instances in App Engine standard, the correct scaling configuration must be chosen. Manual scaling (manual_scaling) sets a fixed number of instances, but the parameters in options A and B are invalid for manual scaling. Basic scaling (basic_scaling) uses max_instances to cap the maximum number of instances. Option D correctly uses basic_scaling with max_instances: 5 and idle_timeout, ensuring the application scales up to 5 instances (but not beyond) and scales down when idle. Options A and C use invalid parameters (min_pending_latency for manual scaling, instances for basic scaling), and option B misuses max_instances for manual scaling. Thus, option D is the valid configuration.
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To limit your App Engine standard environment application to 5 instances with the given configuration, which code snippet should you add to your app.yaml file?
Current configuration:
service: production
instance_class: B1
service: production
instance_class: B1
A
manual_scaling: instances: 5 min_pending_latency: 30ms
B
manual_scaling: max_instances: 5 idle_timeout: 10m
C
basic_scaling: instances: 5 min_pending_latency: 30ms
D
basic_scaling: max_instances: 5 idle_timeout: 10m