logging errors in varnish 4

[Jason Price]

In varnish 3, I did the following to log odd errors to syslog:

        std.syslog((3*8)+5, "returning backend error page. client.ip is " +
client.ip +
               " req.xid is " + req.xid +
               " req.url is " + req.url +
               " original url is " + req.http.originalurl +
               " beresp.status is " + beresp.status);

In varnish 4, vcl_backend_error does not have access to client.* or req.*,
making this problematic at best.

The 'go to' solution seems to be an external log monitor... a daemonized
version of varnishlog which filters out stuff like this.  Certainly doable,
but this feels like a poor solution, compared with the above.

Am I missing something?

-Jason
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