varnish-cache
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New vcl_backend_refresh method
This PR introduces the new vcl_backend_refresh method discussed during VDD23Q3. See: https://github.com/varnishcache/varnish-cache/issues/3102#issuecomment-1737355644 for more context.
You need to update doc/graphviz/cache_*.dot and rebuild doc/graphviz/cache_*.svg as part of this change.
This is also missing the obj_stale variable in vcl_backend_refresh. See how obj is handled for vcl_hit in doc/sphinx/reference/vcl_var.rst.
bugwash: #4026 should be addressed first