```nginx
include conf.d/*;
include sites-enabled/*;
```
In this situation, after the first recursive `_checkConf` invocation 4 lines below, `$_c_file` does not contain what you expect anymore, and the second lookup checks for `conf.d/sites-enabled/*` which is obviously wrong.
Export Le_Domains and Le_Alt so your pre-hook script can run additional checks.
Allows running checks on the domain names before the first call to the ACME API. Thereby not counting against the rate-limit when an issue is going to be problematic.
Supersedes: #3288