fix(monitoring): use a per-second ring buffer for DNS query metrics, improve DNS logging rate limiting and security event aggregation, and bump smartmta dependency

changelog.md

@@ -1,5 +1,15 @@
 # Changelog
 
+## 2026-03-02 - 10.1.5 - fix(monitoring)
+use a per-second ring buffer for DNS query metrics, improve DNS logging rate limiting and security event aggregation, and bump smartmta dependency
+
+- Replace unbounded query timestamp array with a fixed-size per-second Int32Array ring buffer (300s) to calculate queries-per-second with O(1) updates and bounded memory
+- Add incrementQueryRing and getQueryRingSum helpers to correctly zero stale slots and sum recent seconds
+- Change metrics cache interval from 200ms to 1000ms to better match dashboard polling and reduce update frequency
+- Refactor DNS adaptive logging to use per-second counters (dnsLogWindowSecond / dnsLogWindowCount) instead of timestamp arrays to avoid per-query array filtering and improve rate limiting accuracy; reset counters on flush
+- Security logger: avoid mutating source when sorting/filtering, and implement single-pass aggregation with optional time-window filtering for byLevel/byType/top lists
+- Bump dependency @push.rocks/smartmta from ^5.3.0 to ^5.3.1
+
 ## 2026-03-02 - 10.1.4 - fix(no-changes)
 no changes detected; no version bump required