v1.9.1

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Release Notes

New Features & Enhancements

There are no new features or enhancements in this release. This is a point release in the 1.9 series. Refer to the v1.9.0 release notes for more information.

Bug Fixes

Observability

  • Prevented metrics storms from flooding IDM by adding a host-side metrics cache and raising the minimum metrics collection interval to one second.

Core

  • Destroyed zones are now retained as tombstones so their logs remain available for post-mortem inspection.
  • Fixed several IDM deadlocks and throughput bottlenecks under load, including a storm-induced irrecoverable deadlock, bottlenecks that capped packet throughput, and a self-deadlock in stale-stream cleanup, resulting in a 7.5x speedup in IDM throughput.
  • Reworked the zone IDM reader to use a per-backend event channel file descriptor with non-blocking polling.
  • Fixed Xen event channel issues, including retrying ioctls on EINTR and closing a WakeMap unbind/subscribe race.
  • Raised protect-daemon file descriptor limit to 8192.

Upgrade notes

There are no known breaking changes in this release from the previous release v1.9.0.

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