Google Cloud Platform provides health checking mechanisms that determine whether VM instances respond properly to traffic. To respond to traffic, VM instances need to be existing and running. Health checks are not able to target nonexistent instances, or cause instances to be launched without any other, good reason, and thus cause you extra expense. Default time interval is 5 s for health checks, resulting in an amount of traffic that one does not expected to cause huge cost markups. You can disable health checks, if you consider this advantageous. You may check relevant information in documentation, for instance on the "Creating Health Checks" page <https://cloud.google.com/load-balancing/docs/health-checks>.
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