fix(runners): mac2 + no N+1, retain dedicated host (auto-release-host=false) - #1121
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coderbirju
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shashank-boyapally
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Sep 10, 2026
…eeping mac2 + no N+1 We revert the mac-m4 switch (#1117) and the N+1/launch-before-terminate capacity change (#1113) and the mac-15-arm desired reduction (#1115) to match available dedicated hosts, but RETAIN the dedicated host (auto-release-host=false) so a replacement instance relaunches onto the same held host instead of re-allocating a scarce Mac host. Net: mac2.metal, maxCapacity=desired, minInstancesInService=0, auto-release-host=false, mac-15-arm desired=2. Signed-off-by: Arjun Yogidas <arjunry@amazon.com>
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Net state
Reverts the mac-m4 switch (#1117), the N+1 / launch-before-terminate capacity change (#1113), and the mac-finch-15-arm desired reduction (#1115) to match available dedicated hosts — but retains the dedicated host so a replacement instance relaunches onto the same held host instead of re-allocating a scarce Mac dedicated host.
Final net config vs
main:mac2.metal(MAC2/METAL) — not mac-m4props.type.desiredInstances— no N+10false— retain host (unchanged vs main, which already had false; kept intentionally)2allowed-host-families, nomac-m4Only 3 files change vs main:
lib/asg-runner-stack.ts,config/runner-config.json,test/asg-runner-stack.test.ts. WSL pin (#1114) etc. untouched.