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Delete the rollout health monitor ahead of its rewrite - #1847

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Delete the rollout health monitor ahead of its rewrite#1847
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@fzyzcjy

@fzyzcjy fzyzcjy commented Jul 28, 2026

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Part of #1837

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@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch 2 times, most recently from 8b82317 to ca33d43 Compare August 4, 2026 00:39
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from 57bed4e to df1a81f Compare August 4, 2026 06:56
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch from ca33d43 to 5d4ad4b Compare August 4, 2026 06:57
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from df1a81f to 5b39095 Compare August 10, 2026 06:06
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch 2 times, most recently from 071b915 to cd73ffc Compare August 10, 2026 16:07
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from 01932a8 to 33f3f0a Compare August 10, 2026 16:34
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch from cd73ffc to 2cf6ebe Compare August 10, 2026 16:34
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from 33f3f0a to 90a799e Compare August 12, 2026 02:48
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch from 2cf6ebe to 3ca4644 Compare August 12, 2026 02:48
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from 90a799e to faa9a9c Compare August 12, 2026 14:31
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch from 3ca4644 to 8974e1d Compare August 12, 2026 14:31
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from faa9a9c to d4f07c3 Compare August 12, 2026 23:56
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch 2 times, most recently from 492b997 to 3d117b2 Compare August 13, 2026 06:01
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from d4f07c3 to 12fe3b4 Compare August 13, 2026 06:01
RolloutHealthMonitor was the slime-inherited heartbeat thread; rollout fault
tolerance is being rebuilt on the SimpleHealthChecker framework, so remove it
now instead of carrying it (and its ray-thread coordination) through the engine
refactor.

health_monitoring_pause / health_monitoring_resume stay as shells that raise
under --use-fault-tolerance, so a run that asks for fault tolerance fails
loudly instead of silently going unmonitored, and the call sites keep recording
where monitoring has to pause. _try_ci_fault_injection raises for the same
reason: it depended on the monitor to observe the crash it injected.
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op2-10 branch from 12fe3b4 to 8453d85 Compare August 14, 2026 04:46
@fzyzcjy
fzyzcjy force-pushed the tom/refactor-miles/op3-13 branch from 3d117b2 to 39a45d4 Compare August 14, 2026 04:46
@guapisolo

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The trainer-only FT issue identified in this review is fixed later in the chain by #2111 and #2120, both before safe merge checkpoint 1 (#2176). Therefore this PR is safe to approve as part of the full stack.

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