Hi all,

A note on this v5 CI report -- apologies in advance for the thread
noise after several revisions.

The Build-and-Test workflow on series_503840 reports a single failure
on the "linux gcc test -300" matrix entry, at:

  194: ovn.at:13500 - vlan traffic for external network with
       distributed router gateway port

I don't believe this is caused by the patch.  Some context, in case
it helps a maintainer triage:

  * Same v5 run, same -300 test range: "linux gcc test -ljemalloc
    -300" and "linux clang test sanitizers -300" both pass.
    Identical source tree, only the compiler / options differ.
    All 301-600, all 601- (unstable), and the ovn-kubernetes
    workflow all pass.
    https://github.com/ovsrobot/ovn/actions/runs/25712639237

  * v4 (same northd.c, only diff to v5 is "check" -> "check_uuid"
    on one Load_Balancer_Health_Check creation in the *new* unit
    test at tests/ovn-northd.at:1755) passed "linux gcc test -300"
    on its run.  v5's only fail-mode change relative to v4 is in
    the new unit tests #687/#688, which now pass.

  * Test 194 does not configure any Load_Balancer health_check, so
    build_lb_health_check_response_lflows() in northd/northd.c is
    never reached for that test -- the per-backend short-circuit
    at northd.c:8891 ('if (!backend_nb->health_check ||
    !backend_nb->svc_mon_lrp) continue;') skips before any lflow
    this patch modifies is emitted.

  * Local 'make check' on a clean Ubuntu 24.04 build passes all
    227 ovn-northd.at unit tests, including the new #687/#688,
    and test 194/195 (run in isolation) also passes.

Test 194 is a 4-HV pcap-based packet-flow scenario with RA/ARP/L3
timing dependencies, so an intermittent failure under CI container
parallelism seems plausible.  Happy to dig further if anything
looks off; otherwise a retrigger should clear it.

Thanks,
JayGue Lee
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