60 seconds is correct.

Google Cloud Monitoring collects most platform metrics at a default interval of 60 seconds. This one minute granularity is the standard for built in service and system metrics so you get timely data without excessive ingestion rates.

There are exceptions where collection frequency can differ, for example metrics created by agents or custom metrics can be configured to report at different intervals. Those cases are configurable and do not change the default platform metric resolution of 60 seconds.

2 minutes is incorrect because the default interval is shorter at one minute. A two minute default would reduce the temporal resolution that Cloud Monitoring provides by default for platform metrics.

5 minutes is incorrect because that interval is much longer than the default. Five minute sampling is not the standard for Google Cloud platform metrics and would miss finer changes in resource behavior.

30 seconds is incorrect because the default is not that frequent. Some agents or custom setups can collect faster, but the platform default for built in metrics is one minute.

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