+1 For me it is time to mark mod_md as "Stable".I do not foresee expanding functions now we have ACMEv2, OCSP stapling, tls-alpn-01, wildcard etc.
The implemented stapling is great, I recommend it over the mod_ssl stapling. Also I like the mod_status information.
Tested /branches/v2.2.3 intensive and running in production, no issues seen.
I had some notes at https://bz.apache.org/bugzilla/show_bug.cgi?id=63877 They are just to make it a little more user-friendly.
Thanks! Stephan Steffen