Hi,

The new Prometheus metrics endpoint introduced in #505 causes Mailpit to poll api.github.com to check for new versions of Mailpit two times every second minute making our organisation hit the Github rate limit for unauthenticated users.

This causes issues for other parts in our organisation using Githubs API (for instance, Packer and Terraform plugins are fetched from Github).

From what I've gathered, this is caused by prometheus.UpdateMetrics() calling stats.Load() which in turn calls updater.GithubLatest(), though I haven't been able to figure out why it's causing two requests each iteration as seen in our firewall logs.