- ipng_stats_logtail now accepts an optional if=$variable parameter
that suppresses log lines when the variable is empty or "0",
following the same semantics as nginx's access_log if=. The
condition is checked before format rendering for zero overhead on
filtered requests. Filtered requests are still counted by stats.
- Log format examples updated to include $scheme for http/https
visibility, and renamed to ipng_stats_logtail to match production.
- Robot test added for the if= filter (19 tests, 19 pass).
- FR-8.5 added to design doc for the if= semantics.
Pim van Pelt
87050bcf13