Slow down fresh-job pickup on meta-staging-aws-ue1 to test peak smoothing#881
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…hing **Impact:** meta-staging-aws-ue1 staging cluster only (c-mt- runners); no prod impact **Risk:** low ## What Lower `capacity_aware_fresh_multiplier` from `0.8` to `0.25` for the `arc-runners` module on the `meta-staging-aws-ue1` staging cluster, so this peer claims a smaller slice of the fresh queued-job pool and starts new runner pairs more slowly. ## Why Experiment: accepting fresh jobs more slowly should flatten burst peaks and let scheduling settle, which may improve bin-packing and node utilization. Staging-only knob change to observe the effect before considering it for prod. # Notes Staging is a safe place to test this — `proactive_capacity_max: 0` means no warm pool, only on-demand pairs. Watch queue latency vs. utilization; a value this low trades faster job start for longer queue times, so revert or tune up if pickup lags too much. Signed-off-by: Jean Schmidt <contato@jschmidt.me>
tofu plan — meta-prod-aws-ue2✅ Plan succeeded · commit Plan output |
tofu plan — meta-prod-aws-uw1✅ Plan succeeded · commit Plan output |
tofu plan — meta-prod-aws-ue1✅ Plan succeeded · commit Plan output |
tofu plan — lf-prod-aws-ue1✅ Plan succeeded · commit Plan output |
tofu plan — lf-prod-aws-ue2✅ Plan succeeded · commit Plan output |
huydhn
approved these changes
Jul 7, 2026
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Impact: meta-staging-aws-ue1 staging cluster only (c-mt- runners); no prod impact
Risk: low
What
Lower
capacity_aware_fresh_multiplierfrom0.8to0.25for thearc-runnersmodule on themeta-staging-aws-ue1staging cluster, so this peer claims a smaller slice of the fresh queued-job pool and starts new runner pairs more slowly.Why
Experiment: accepting fresh jobs more slowly should flatten burst peaks and let scheduling settle, which may improve bin-packing and node utilization. Staging-only knob change to observe the effect before considering it for prod.