Pim van Pelt 87050bcf13 Add logtail if=$variable filtering and update log format examples ...

- 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.

2026-04-16 18:49:22 +02:00

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