Counters for connect and reuse were added in the stats with commit
f1573848 ("MINOR: backend: count the number of connect and reuse
per server and per backend") but not documented the CSV format in
management.txt
81: dcon [LF..]: requests denied by "tcp-request connection" rules
82: dses [LF..]: requests denied by "tcp-request session" rules
83: wrew [LFBS]: cumulative number of failed header rewriting warnings
+ 84: connect [..BS]: cumulative number of connection establishment attempts
+ 85: reuse [..BS]: cumulative number of connection reuses
9.2) Typed output format