send metric data to hosted graphite via HTTP POST.

metric_to_graphite.js

/* send a metric to hosted graphite via HTTP POST (async). */
 
function sendMetricToGraphite(metricName, value) {
    var apiKey = YOUR-API-KEY;
    var url = "https://" + apiKey + "@www.hostedgraphite.com/api/v1/sink";
    var request = new XMLHttpRequest();
    request.open("POST", url, true);
    request.send(metricName + " " + value);
};


/* usage: */

sendMetricToGraphite("load_time", 59)

Just a note about that, because Chrome is blocking basic auth in URLs. More info: https://medium.com/@lmakarov/say-goodbye-to-urls-with-embedded-credentials-b051f6c7b6a3

I'll continue trying to make it works, thanks for your first clue :)