DOC: log-format documentation

doc/configuration.txt

@@ -75,6 +75,7 @@ Summary
 8.2.1.        Default log format
 8.2.2.        TCP log format
 8.2.3.        HTTP log format
+8.2.4.        Custom log format
 8.3.      Advanced logging options
 8.3.1.        Disabling logging of external tests
 8.3.2.        Logging before waiting for the session to terminate
@@ -2644,6 +2645,11 @@ no log
     log 127.0.0.1:514 local0 notice         # only send important events
     log 127.0.0.1:514 local0 notice notice  # same but limit output level
 
+log-format <string>
+   Allows you to custom a log line.
+
+   See also : Custom Log Format (8.2.4)
+
 
 maxconn <conns>
   Fix the maximum number of concurrent connections on a frontend
@@ -8216,7 +8222,7 @@ about log facilities.
 8.2. Log formats
 ----------------
 
-HAProxy supports 4 log formats. Several fields are common between these formats
+HAProxy supports 5 log formats. Several fields are common between these formats
 and will be detailed in the following sections. A few of them may vary
 slightly with the configuration, due to indicators specific to certain
 options. The supported formats are as follows :
@@ -8244,6 +8250,8 @@ options. The supported formats are as follows :
     timers, captures, flags, etc... appear one per field after the end of the
     common fields, in the same order they appear in the standard HTTP format.
 
+  - the custom log format, allows you to make your own log line.
+
 Next sections will go deeper into details for each of these formats. Format
 specification will be performed on a "field" basis. Unless stated otherwise, a
 field is a portion of text delimited by any number of spaces. Since syslog
@@ -8718,6 +8726,81 @@ Detailed fields description :
     is the reason why this field must always remain the last one.
 
 
+8.2.4 Custom log format
+-----------------------
+
+The directive log-format allows you to custom the logs in http mode. It takes a
+string as argument.
+
+HAproxy understands some log format variables. % precedes log format variables.
+Variables can take arguments using braces ('{}'), and multiple arguments are
+separated by commas within the braces. Flags may be added or removed by
+prefixing them with a '+' or '-' sign.
+
+Special variable "%o" may be used to propagate its flags to all other
+variables on the same format string. This is particularly handy with quoted
+string formats ("Q").
+
+Note: spaces must be escaped. A space character is considered as a separator.
+HAproxy will automatically merge consecutive separators.
+
+Flags are :
+  * Q: quote a string
+
+  Example:
+
+    log-format %T\ %t\ Some\ Text
+    log-format %{+Q}o\ %t\ %s\ %{-Q}r
+
+At the moment, the default HTTP format is defined this way :
+
+    log-format %Ci:%Cp\ [%t]\ %f\ %b/%s\ %Tq/%Tw/%Tc/%Tr/%Tt\ %st\ %B\ %cc\ \
+               %cs\ %ts\ %ac/%fc/%bc/%sc/%rc\ %sq/%bq\ %hr\ %hs\ %{+Q}r
+
+And the default CLF format is defined this way :
+
+    log-format %{+Q}o\ %{-Q}Ci\ -\ -\ [%T]\ %r\ %st\ %B\ \"\"\ \"\"\ %Cp\ \
+               %ms\ %f\ %b\ %s\ \%Tq\ %Tw\ %Tc\ %Tr\ %Tt\ %ts\ %ac\ %fc\ \
+               %bc\ %sc\ %rc\ %sq\ %bq\ %cc\ %cs\ \%hrl\ %hsl
+
+Please refer to the table below for currently defined variables :
+
+    +------+-----------------------------------------------+-------------+
+    | var  | field name (8.2.2 and 8.2.3 for description)  | type        |
+    +------+-----------------------------------------------+-------------+
+    | %o   | special variable, apply flags on all next var |             |
+    +------+-----------------------------------------------+-------------+
+    | %B   | bytes_read                                    | numeric     |
+    | %Ci  | client_ip                                     | string      |
+    | %Cp  | client_port                                   | numeric     |
+    | %Tc  | Tc                                            | numeric     |
+    | %Tq  | Tq                                            | numeric     |
+    | %Tr  | Tr                                            | numeric     |
+    | %Tt  | Tt                                            | numeric     |
+    | %Tw  | Tw                                            | numeric     |
+    | %ac  | actconn                                       | numeric     |
+    | %b   | backend_name                                  | string      |
+    | %bc  | beconn                                        | numeric     |
+    | %bq  | backend_queue                                 | numeric     |
+    | %cc  | captured_request_cookie                       | string      |
+    | %cs  | captured_response_cookie                      | string      |
+    | %f   | frontend_name                                 | string      |
+    | %fc  | feconn                                        | numeric     |
+    | %hr  | captured_request_headers default style        | string      |
+    | %hrl | captured_request_headers CLF style            | string list |
+    | %hs  | captured_response_headers default style       | string      |
+    | %hsl | captured_response_headers CLF style           | string list |
+    | %ms  | accept date milliseconds                      | numeric     |
+    | %r   | http_request                                  | string      |
+    | %rc  | retries                                       | numeric     |
+    | %s   | server_name                                   | string      |
+    | %sc  | srv_conn                                      | numeric     |
+    | %sq  | srv_queue                                     | numeric     |
+    | %st  | status_code                                   | numeric     |
+    | %ts  | termination_state                             | string      |
+    +------+-----------------------------------------------+-------------+
+
+
 8.3. Advanced logging options
 -----------------------------