Statistics for backend open errors
Previously, we had zero stats on the cause of backend connection errors, which made it close to impossible to diagnose such issues in retrospect (only via log mining). We now pass an optional backend vsc to vcp and record errors per backend. Open errors are really per vcp entry (ip + port or udc path), which can be shared amongst backends (and even vcls), but we maintain the counters per backend (and, consequently, per vcl) for simplicity. It should be noted though that errors for shared endpoints affect all backends using them. Ref #2622
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