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* ci(perf): warp A/B relative-budget gate for the hotpath series performance.yml only uploads a samply profile and a cargo-bench artifact with no pass/fail, so a 26x-class write-path regression like #4221 or the GET perf churn would sail through CI and only surface in customer load tests. This adds the missing gate — the acceptance surface every queued HP change (#922/#923/ #925/#927/#930/#932) needs before its default can flip. - scripts/hotpath_warp_ab_gate.sh: applies the relative budget to the baseline_compare.csv that run_object_batch_bench_enhanced.sh already emits (it computes deltas but never gates). A metric regressing past --fail-pct fails, past --warn-pct warns; reqps/throughput are higher-is-better, latency lower-is-better. --allow-regression downgrades a FAIL to an exempted WARN so a deliberate correctness cost (e.g. #4221) is recorded, not blocked (rustfs/backlog#935 correction 1). Unit-checked across pass/warn/fail/exempt. - scripts/run_hotpath_warp_ab.sh: single-host baseline-binary vs candidate- binary A/B over {put-4mib, get-4mib, mixed-256k} x {drive-sync on, off}, reusing the enhanced bench as the warp driver and the single-node local-disk lifecycle. Has --dry-run; warp is assumed pre-installed as elsewhere in scripts/. Drive-sync on/off keeps a sync-semantics change from being masked by nosync numbers. - .github/workflows/performance-ab.yml: nightly on main (post-merge detection) plus opt-in pre-merge via the `perf-ab` label; `perf-deliberate-tradeoff` runs the gate with --allow-regression; posts the gate table as a PR comment and uploads the run. A Linux runner answers "do the macOS conclusions hold". The gate logic is unit-validated with synthetic compare CSVs; the orchestrator and workflow are shellcheck- and --dry-run-validated. The first real warp measurement belongs on the Linux runner (no warp/multi-disk rig locally). Refs: rustfs/backlog#935 (HP-14 warp A/B gate, item 4), rustfs/backlog#725 (cooled A/B harness precedent), rustfs/backlog#936 Co-Authored-By: heihutu <heihutu@gmail.com> * ci(perf): pin upload-artifact, add external-cluster A/B mode + runbook - Pin actions/upload-artifact to the repo-standard full-length SHA (# v6); the previous @v4 float tripped the workflow-pin guard. - Add an external deployment mode to run_hotpath_warp_ab.sh so warp can target an already-running cluster instead of a throwaway single-node server: --endpoint selects the cluster and --deploy-hook runs between phases to swap in the phase's binary and drive-sync config (context passed via HOTPATH_AB_PHASE / HOTPATH_AB_BINARY / HOTPATH_AB_DRIVE_SYNC). This maps onto the team's ansible harness (cargo zigbuild -> ansible rustfs-manage --tags stop,config,binary-copy,start -> warp). - Restructure the matrix loop to bring a deployment up once per (phase, drive-sync) and run all three workloads against it, instead of restarting per workload — fewer server starts / cluster redeploys. Baseline medians are read from a deterministic path, dropping the bash-4-only associative array so the script (and its --dry-run self-check) runs on macOS bash 3.2 too. - Add docs/operations/hotpath-warp-ab-runbook.md tying local mode, the ansible external mode, and the budget/exemption together. Verification: shellcheck clean; --dry-run in both modes prints the expected 4 deployments x 3 workloads and passes exactly 6 compare CSVs to the gate; check_workflow_pins.sh, check_doc_paths.sh, and make pre-commit all pass. Refs: rustfs/backlog#935, rustfs/backlog#936 Co-Authored-By: heihutu <heihutu@gmail.com> --------- Co-authored-by: heihutu <heihutu@gmail.com>