[Varnish] #1704: fetch_failed not incremented

[Varnish]

#1704: fetch_failed not incremented
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 Reporter:  fgsch     |      Owner:
     Type:  defect    |     Status:  new
 Priority:  normal    |  Milestone:
Component:  varnishd  |    Version:  trunk
 Severity:  normal    |   Keywords:
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 fetch_failed description says "Fetch failed (all causes)" but the counter
 is not incremented for connect_timeout, first_byte_timeout or
 between_bytes_timeout timeouts.

 For connect_timeout timeout, backend_fail is increased though.

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Ticket URL: <https://www.varnish-cache.org/trac/ticket/1704>
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