Add X-Request-Start header so we can track queue times in New Relic RPM beginning at Varnish. - Fixed for Varnish 3.0.2-1 on Ubuntu.

default.vcl

# For Varnish NewRelic Tracking
# https://gist.github.com/2820068
C{
  #include <stddef.h>
  #include <stdio.h>
  #include <sys/time.h>
}C


sub vcl_recv {
  C{
    #include </etc/varnish/newrelic.h>
  }C

  # ...
}

newrelic.h

/*
 * Add X-Request-Start header so we can track queue times in New Relic RPM beginning at Varnish.
 *
 */

 struct timeval detail_time;
 gettimeofday(&detail_time, 0);
 char start[20];
 sprintf(start, "t=%lu%06lu", detail_time.tv_sec, detail_time.tv_usec);
 VRT_SetHdr(sp, HDR_REQ, "\020X-Request-Start:", start, vrt_magic_string_end);