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DOC: Explanation of be_name and be_id fetches

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The be_name and be_id fetches contain data related to the current
backend and can be used in frontend responses. Yet, in cases where
no backend is used due to a local response or backend selection
failure, these fetches retain details of the current frontend.

This patch enhances the clarity of the values provided by these
fetches.

Signed-off-by: Sbastien Gross <sgross@haproxy.com>
This commit is contained in:
Sbastien Gross 2023-08-23 05:49:11 -04:00 committed by Willy Tarreau
parent 0a20be8915
commit f20f85f4d7
1 changed files with 9 additions and 5 deletions
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14
doc/configuration.txt
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@ -19959,13 +19959,16 @@ bc_src_port : integer
be_id : integer
Returns an integer containing the current backend's id. It can be used in
frontends with responses to check which backend processed the request. It can
also be used in a tcp-check or an http-check ruleset.
frontends with responses to check which backend processed the request. If
used in a frontend and no backend was used, it returns the current
frontend's id. It can also be used in a tcp-check or an http-check ruleset.
be_name : string
Returns a string containing the current backend's name. It can be used in
frontends with responses to check which backend processed the request. It can
also be used in a tcp-check or an http-check ruleset.
frontends with responses to check which backend processed the request. If
used in a frontend and no backend was used, it returns the current
frontend's name. It can also be used in a tcp-check or an http-check
ruleset.
bc_rtt(<unit>) : integer
Returns the Round Trip Time (RTT) measured by the kernel for the backend
@ -23663,7 +23666,8 @@ Please refer to the table below for currently defined variables :
| | %ac | actconn | |
| | | %[act_conn] | numeric |
+---+------+------------------------------------------------------+---------+
| | %b | backend_name | string |
| | %b | backend_name | |
| | | %[be_name] | string |
+---+------+------------------------------------------------------+---------+
| | %bc | beconn (backend concurrent connections) | numeric |
+---+------+------------------------------------------------------+---------+