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ci(fleet): serialize the remainder lane to lower peak hosted-runner demand #544

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Merged
joshua-temple merged 1 commit into from
Jul 9, 2026
Merged

ci(fleet): serialize the remainder lane to lower peak hosted-runner demand #544

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17 changes: 12 additions & 5 deletions .github/workflows/fleet-e2e.yaml
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Original file line number Diff line number Diff line change
Expand Up @@ -439,10 +439,17 @@ jobs:
# them re-dispatches once rather than redding the whole fleet.
retry-attempts: '2'

# Lane 3: the light remainder, capped at two repos in flight. Sequenced AFTER
# the heavy lane (via needs) so 4env and this capped matrix never overlap;
# `always()` lets it proceed when the heavy lane was filtered out. Still gated
# on a green repin. max-parallel keeps live API pressure at two repos.
# Lane 3: the light remainder, run one repo at a time. Sequenced AFTER
# the heavy lane (via needs) so 4env and this matrix never overlap;
# `always()` lets it proceed when the heavy lane was filtered out. Still
# gated on a green repin. max-parallel is serialized (was 2) to lower the
# fleet's peak hosted-runner demand: each suite dispatches several of its
# own child runs, so two suites in flight at once was enough concurrent
# runner requests that GitHub occasionally could not acquire a hosted
# runner in time and cancelled the lane. Running the remainder repos one at
# a time trades a longer remainder lane for far fewer runner-starvation
# flakes, without touching the already-serial primary/dependents/heavy
# sequencing ahead of it.
remainder:
name: remainder (${{ matrix.repo }})
needs: [resolve, plan, repin, heavy]
Expand All @@ -453,7 +460,7 @@ jobs:
actions: read
strategy:
fail-fast: false
max-parallel: 2
max-parallel: 1
matrix:
repo: ${{ fromJSON(needs.plan.outputs.remainder_repos) }}
steps:
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