A shared counter is added in the thread context to track the current number of streams. This number is then reported in stats. It will be a useful information to diagnose some bugs. (cherry picked from commit 18ee22ff766bd7399947af3be2b512ac5827b3c8) [wt: adj ctx in tinfo-t] Signed-off-by: Willy Tarreau <w@1wt.eu>