Better outage notification emails

[iloire]

No description provided.

[zarzen]

We simply customize like this when outage happens:
var error = JSON.parse(JSON.stringify(outage.error));
so, here we need to put some useful information when ping is failed, like this:

var error = {"code":"xxx", "message":err.message};
callback(error, "failed", "failed", time);

But this feature seems should be done in the plugin and ping-service projects?