koa-router-newrelic sets the transation name(s) matched by koa-router.
npm install koa-router-newrelic
koa-router is patched with the app.getRouter() router, which is used to tap into the koa-router instance:
npm install git://github.com/ifroz/koa-router.git
var app = koa();
app.use(require('koa-router-newrelic')(app));