Is it possible to have 2 Error Logs per VirtualHost in Apache?

No, it is not possible to have two ErrorLog directives per VirtualHost. However, you could use Apache's ability to pipe to a command in order to log to two (or more) files using the UNIX 'tee' command:

ErrorLog "|/usr/bin/tee -a /var/log/apache/error-1.log /var/log/apache/error-2.log"

According to the Apache 2.4 Logs documentation:

By default the piped log process is spawned without invoking a shell. Use "|$" instead of "|" to spawn using a shell (usually with /bin/sh -c):

This was the default behaviour for Apache 2.2.

Example:

# Write to files error-1.log and error-2.log, and echo to stdout
CustomLog "|$/usr/bin/tee -a /var/log/apache/error-1.log /var/log/apache/error-2.log"

Another issue I ran into:

• You should not have a space between the Double-Quote and Bar.
  • "|$ ... is valid.
  • " |$ ... is not.