10.2.x: Add log field fallbacks (#13018) - #13109
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Allow custom log formats to fall back between header fields with
`??` so configs can log a secondary header when the primary one is
absent. This keeps the feature in the existing `%<...>` syntax and
preserves the current distinction between missing and empty values.
This also:
- Allows overriding the default static fallback from `-` to
some user-specified quoted string literal.
- Adds support for a final non-header log field (e.g., chi, cqup) as
the fallback term, letting users write expressions like
%<{x-remote-ip}cqh??chi>.
(cherry picked from commit c478245)
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Allow custom log formats to fall back between header fields with
??so configs can log a secondary header when the primary one is absent. This keeps the feature in the existing%<...>syntax and preserves the current distinction between missing and empty values.This also:
-to some user-specified quoted string literal.(cherry picked from commit c478245)