func ValidateZipkinCollector(z *meshconfig.Tracing_Zipkin) error {
	return ValidateProxyAddress(strings.Replace(z.GetAddress(), "$(HOST_IP)", "127.0.0.1", 1))
}

// ValidateDatadogCollector validates the configuration for sending envoy spans to Datadog
func ValidateDatadogCollector(d *meshconfig.Tracing_Datadog) error {
	// If the address contains $(HOST_IP), replace it with a valid IP before validation.