// Fill the number of calls to make.
	o.fillCallCount()

	// Fill connection parameters based on scheme and workload type.
	o.fillConnectionParams()

	// Fill in default retry options, if not specified.
	o.fillRetryOptions()

	// check must be specified
	if o.Check == nil {
		panic("o.Check not set")
	}

	// If ProxyProtoVersion is not 0, 1, or 2, default to 0 (disabled)
	o.fillProxyProtoVersion()

	return nil