Traditionally OCSP stapling implementations in the major webservers (nginx+apache) have been pretty bad and are not capable of mitigating OCSP server downtimes.

Traditionally OCSP stapling implementations in the major webservers (nginx+apache) have been pretty bad and are not capable of mitigating OCSP server downtimes. Apache has a new stapling implementation since a few versions that can be enabled with "MDStapling On", I don't think it gets enabled by default yet.