On buster we see the following error
[Wed Oct 09 14:23:12.440462 2019] [ssl:emerg] [pid 31716] AH02561: Failed to configure certificate puppetmaster.test.eqiad.wmnet:443:0, check /var/lib/puppet/ssl/certs/puppetmaster.test.eqiad.wmnet.pem [Wed Oct 09 14:23:12.440575 2019] [ssl:emerg] [pid 31716] SSL Library Error: error:140AB18F:SSL routines:SSL_CTX_use_certificate:ee key too small
for now i have addeed CipherString = DEFAULT@SECLEVEL=1 to /etc/ssl/openssl.cnf however we can simply remove the test vhost