The feature specific settings to be used in the application.
These define behaviors that are user configurable.
Boolean value indicating if split health checks should be
used instead of the legacy health checks. At an app.yaml
level, this means defaulting to 'readiness_check' and
'liveness_check' values instead of 'health_check' ones. Once
the legacy 'health_check' behavior is deprecated, and this
value is always true, this setting can be removed.