Symbiosis: Optional symbiosis-httpd-logger package fails under load
Imported from https://www.github.com/BytemarkHosting/symbiosis/issues/113
Under high loads with a large number of sites (and therefore large number of instances of the logger), the symbiosis-httpd-logger process stalls and fails to write logs, apparently causing Apache to stall and spin up more processes to deal with the incoming traffic.
A workaround for this seems to be to be to adjust the Apache templates for HTTP/HTTPS sites to log directly to disk, saving the extra processor time and RAM, however this means the logs directories won't be automatically generated (should be fixable in symbiosis-httpd-configure or elsewhere, and log files will not be owned by admin:admin (which is not a huge problem, as they are cycled automatically, and still readable by admin).