MEDIUM: log: add a new cookie flag 'U' to report situations where cookie is not used
This happens when a "use-server" rule sets the server instead.
diff --git a/doc/configuration.txt b/doc/configuration.txt
index 337cfad..de052e1 100644
--- a/doc/configuration.txt
+++ b/doc/configuration.txt
@@ -9184,6 +9184,10 @@
the cookie is consider too OLD and is ignored. The request will be
redispatched just as if there was no cookie.
+ U : a cookie was present but was not used to select the server because
+ some other server selection mechanism was used instead (typically a
+ "use-server" rule).
+
- : does not apply (no cookie set in configuration).
- the last character reports what operations were performed on the persistence