Nginx
Rate Limiting an aggressive bot in Nginx
High load isn't necessarily an emergency, but it may be a heads-up before a site noticeably slows down. Sometimes there are weird spikes that just go away, but sometimes this is an indication of a Denial of Service.
Nginx: Fix for redirect loop on D8 sites
On one of our D8 sites, after upgrading to 8.3.0, we had a "too many redirects" loop going on on the dev server. For quite some time, we've had the site path repeated with "?q=".