This option can be used to define a specific log format that will be used in case of error, timeout, connection failure on a frontend... It will be used for any log line concerned by the log-separate-errors option. It will also replace the format of specific error messages decribed in section 8.2.6. If no "error-log-format" is defined, the legacy error messages are still emitted and the other error logs keep using the regular log-format.
File list: - common.pem: PEM file which may be used by most of the VTC files.