news: add entry for #398

Signed-off-by: László Várady <laszlo.varady@anno.io>
axoflow · Nov 28, 2024 · 815384e · 815384e
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+Metrics for FilterX expression execution
+
+Metrics `syslogng_fx_*_evals_total` are available on `stats(level(3))`.
+They can be used to gain insight on how FilterX expressions are executed on
+different messages and paths and to find potential bottlenecks.