Any updates on this? We are having the same issue that the actual error is not showing up in the render log. Is it possible currently to implement a multi-line regex matcher?
StdOutHandler is line-based, so it would not be possible to match a multi-line regex. I guess the main remaining option is to read the next line of input, but this does not seem possible, from the documentation. There is a function to get the previous line, however.