How to send duplicate RemoteWrite metrics

When working with metrics, you may want to send the metrics you’ve collected to 2 different prometheus instances for backup. Despite that a feature in Prometheus allows you send the metrics received to another prometheus, it’s not recommended to do that when working with high amounts of metrics. Indeed, Prometheus consumes a lot of resources to do the remotewrite and this may reduce its capability to perform well. But other solution exists : lightweight, simple and works perfectly.