[Kitenite]

What

Adds Fly's Sydney region (syd) to the relay fleet, bringing it to 7 machines, 1 per region: sjc (primary), iad, fra, nrt, sin, syd, gru.

Why

The relay fleet is driven entirely by the REGIONS array in apps/relay/scripts/deploy.sh — the relay reads FLY_REGION dynamically and fly-replay routes by region string, so there's no client-side allowlist to touch.

Australian users previously had no closer relay than sin/nrt. When their remote host lands in a Sydney-adjacent Fly region, the region mismatch surfaces as a relay 502 on WebSocket upgrades (fly-replay isn't transparent for WS upgrades). A syd machine gives AU traffic a local relay and closes that gap.

Changes

• apps/relay/scripts/deploy.sh — add syd to REGIONS (6 → 7)
• apps/relay/fly.toml — update topology comment

Rollout

Run apps/relay/scripts/deploy.sh: the fly scale count "app=7" --region ... --max-per-region 1 step provisions the Sydney machine, followed by the rolling deploy and smoke test (which now covers syd).

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Summary by cubic

Add syd (Sydney) to the relay fleet, bringing it to 7 regions with 1 machine each. This gives AU users a local relay and reduces WebSocket 502s caused by region mismatches.

• Migration
  • Run apps/relay/scripts/deploy.sh; it scales to 7 regions (adds syd), deploys, and runs smoke tests.

^{Written for commit 8ab79f2. Summary will update on new commits.}

Summary by CodeRabbit

• Chores
  • Expanded deployment coverage to an additional region.
  • Updated scaling settings so the service now starts with one more machine, improving regional availability and consistency.

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[ghost]

Ready to review this PR? Stage has broken it down into 2 individual chapters for you:

	Title
1	Add Sydney region to relay deployment script
2	Update topology documentation in fly.toml

_{Chapters generated by Stage for commit 8ab79f2 on Jul 9, 2026 6:51pm UTC.}

[coderabbitai]

No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: defaults

Review profile: CHILL

Plan: Pro

Run ID: 4ef71b40-fe79-42e7-87b0-b8c3b052243f

📥 Commits

Reviewing files that changed from the base of the PR and between 4ea555e and 8ab79f2.

📒 Files selected for processing (2)

• apps/relay/fly.toml
• apps/relay/scripts/deploy.sh

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📝 Walkthrough

Walkthrough

The relay deployment script's REGIONS array is expanded to include the "syd" region, affecting the computed machine count and region list used for fly scale and smoke test invocations. The fly.toml comment is updated to reflect the new target of 7 machines (1 per region).

Changes

Relay Region Expansion

Layer / File(s)	Summary
Add syd region to deploy fleet apps/relay/scripts/deploy.sh, apps/relay/fly.toml	REGIONS array now includes syd, changing computed COUNT and REGION_LIST for fly scale and smoke test; fly.toml comment updated from 6 to 7 machines (1 per region).

Estimated code review effort: 1 (Trivial) | ~2 minutes

Possibly related PRs

• superset-sh/superset#4678: Both PRs modify apps/relay/scripts/deploy.sh's REGIONS list and derived region count/list used for fly scale.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Title check	✅ Passed	The title clearly states the main change: adding the Sydney relay region to the relay fleet.
Description check	✅ Passed	The description covers what changed, why, rollout, and the affected files, though some template sections are left unfilled.
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.

✨ Finishing Touches

📝 Generate docstrings

• Create stacked PR
• Commit on current branch

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch add-australia-relay-regio

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[greptile-apps]

Greptile Summary

This PR adds Fly's Sydney (syd) region to the relay fleet, growing it from 6 to 7 machines (one per region). The change reduces latency for Australian users who previously had to rely on sin or nrt as their nearest relay.

• apps/relay/scripts/deploy.sh — syd inserted into the REGIONS array; COUNT and REGION_LIST are derived automatically, so the fly scale count call and smoke test both pick it up with no further edits required.
• apps/relay/fly.toml — topology comment updated to reflect the new 7-machine target and includes syd in the region list.

Confidence Score: 5/5

Safe to merge — single-region addition with no logic changes and automatic propagation through the deploy script.

The change is two lines: one string inserted into a bash array, one comment updated. COUNT and REGION_LIST are both derived from the array at runtime, so the scale count, rolling deploy, and smoke test all cover syd automatically. The fly.toml comment is accurate. No risk of misconfiguration or regression.

No files require special attention.

Important Files Changed

Filename	Overview
apps/relay/scripts/deploy.sh	Adds syd to the REGIONS array; COUNT and REGION_LIST are derived from the array, so scale count, deploy, and smoke-test arguments all update automatically.
apps/relay/fly.toml	Comment-only update: topology description now reflects 7 machines with syd included — no functional config changes.

Flowchart

%%{init: {'theme': 'neutral'}}%%
flowchart TD
    subgraph deploy["deploy.sh execution"]
        A["REGIONS=(sjc iad fra nrt sin syd gru)"] --> B["fly scale count app=7\n--region sjc,iad,fra,nrt,sin,syd,gru\n--max-per-region 1"]
        B --> C["fly deploy (rolling)"]
        C --> D["fly status"]
        D --> E["smoke-test.sh over all 7 regions"]
    end

    subgraph fleet["Relay Fleet (post-deploy)"]
        sjc["sjc — primary"]
        iad["iad"]
        fra["fra"]
        nrt["nrt"]
        sin["sin"]
        syd["syd NEW"]
        gru["gru"]
    end

    E --> fleet

Loading

%%{init: {'theme': 'base', 'themeVariables': {"darkMode": true, "background": "#0d1117", "primaryColor": "#21262d", "primaryTextColor": "#e6edf3", "primaryBorderColor": "#8b949e", "lineColor": "#8b949e", "textColor": "#e6edf3", "edgeLabelBackground": "#161b22", "actorBkg": "#21262d", "actorBorder": "#8b949e", "actorTextColor": "#e6edf3", "actorLineColor": "#8b949e", "signalColor": "#8b949e", "signalTextColor": "#e6edf3", "noteBkgColor": "#373320", "noteBorderColor": "#d4a72c", "noteTextColor": "#f0e6c0", "labelBoxBkgColor": "#21262d", "labelBoxBorderColor": "#8b949e", "labelTextColor": "#e6edf3", "loopTextColor": "#e6edf3", "activationBkgColor": "#30363d", "activationBorderColor": "#8b949e"}}}%%
flowchart TD
    subgraph deploy["deploy.sh execution"]
        A["REGIONS=(sjc iad fra nrt sin syd gru)"] --> B["fly scale count app=7\n--region sjc,iad,fra,nrt,sin,syd,gru\n--max-per-region 1"]
        B --> C["fly deploy (rolling)"]
        C --> D["fly status"]
        D --> E["smoke-test.sh over all 7 regions"]
    end

    subgraph fleet["Relay Fleet (post-deploy)"]
        sjc["sjc — primary"]
        iad["iad"]
        fra["fra"]
        nrt["nrt"]
        sin["sin"]
        syd["syd NEW"]
        gru["gru"]
    end

    E --> fleet

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