Overview Atlas ★Harness FleetOps WorkLedger Architecture Activity ●

62.4% migratedAAles · dealsSign outGSign in

ATLAS ★HOMENEWSCHANGESGLOSSARYQ&ASTREAM · 9

ATLAS ★ · THE HOME OF THE REFACTOR · SIGNED OUT

Atlas asks you the questions the rebuild can't answer alone.

The migration runs on agents — but when one hits something only a human knows (a business rule, an owner, which rounding is correct), Atlas routes that question to the right person with an SLA countdown. Your answer is written back once and unblocks every agent waiting on it, forever.

GSign in with GoogleONE CLICK · @GROUPON.COM ONLY · NO SETUP

WAITING2 questions are routed to someone on deals — first SLA expires in 1h 12mWhich rounding is correct for refunds over $100…SIGN IN TO SEE THEM →

Hi Ales — 2 things need you.

TUE JUL 21 · WEEK 34 OF THE REBUILD

AYOUR INBOX — ROUTED TO YOU, NOT A FEED2 OPEN · SIGNED IN AS ales@groupon.comSign out

ANSWER BY 16:00Which rounding is correct for refunds over $100 — legacy half-up, or bankers'?

1h 12m

4 AGENTS BLOCKED · ORDERS-ONLY · ASKED VIA WORKLEDGER U-88412

Answer nowReroute → ⚙ Tomas

RECONFIRM BY FRIYour answer #0015 — VIS ownership expires.

Still true — reconfirm ✓

Stale answers are never served silently — reconfirm it, or it starts warning every reader.

TODAY ACROSS THE REFACTOR

TUE JUL 21 · WEEK 34

LATEST · NEWS ⚙

MILESTONE⚙ ROBERT · TODAY

Orders enters shadow traffic

Parity 99.987% and climbing — cutover gate 99.999%.

HEADS-UP⚙ FRANTA · WED

deal-catalog write freeze — Wed 9:00–11:00

Deal editors only; merchants unaffected.

LATEST · CHANGES

#241 · ORDERS

Cutover now gated behind parity harness

Means: nothing ships until replay matches legacy 1:1.

#240 · ACCOUNTS

identity-service retired → users owns identity

5 comments · glossary updated

GLOSSARY: VIS → inventory · 348 TERMS

LATEST · Q&A + STREAM

"Does /tps keep the same contract after cutover?"

DUSAN → ⚙ TOMAS · SLA 4H

Open questions9

Breaching — escalates soon1

Bot-answered this week31

WHAT'S INSIDE ATLAS

01 / NEWS

Orders enters shadow traffic — parity 99.987%

3 POSTS THIS WEEK · SIGNED ⚙

Open →

02 / CHANGES

#241 — cutover gated behind parity harness

2 OPEN FOR COMMENT

Open →

03 / GLOSSARY

348 terms — old name → new name

STALE ENTRIES WARN FIRST

Open →

04 / Q&A

Ask once — the bot answers forever

12 ANSWERED THIS WEEK

Open →

05 / STREAM

9 open questions · 1 breached → escalated

FIRST ESCALATES IN 0h 07m

Open →

01 / NEWS ⚙

News from the refactoring team

Humans writing to humans — every number is pulled live from the ledger, never typed.

MILESTONE⚙ RobertTODAY · ALL-HANDS · PINNED

Orders enters shadow traffic

Every checkout now runs on both stacks in parallel. Parity is at 99.987% and climbing — nothing cuts over until it holds 99.999%. What this means for you: checkout stays safe, and you'll see it proven live on Harness.

14 COMMENTS · 3 QUESTIONS SPUN OFF TO Q&A

WEEKLY DIGEST⚙ Petr

Week 34 — 214 units migrated, 0 rollbacks

Long-tail lane ahead of schedule; VIS strangler finished after 13 frozen years.

HEADS-UP⚙ Franta

deal-catalog write freeze — Wed 9:00–11:00

Affects deal editors only. Merchants unaffected.

MILESTONE⚙ TomasMON

1,000th unit hits MIGRATED

Average cost per merged unit: $0.38 · 2.1 attempts. Every one carries a Harness evidence bundle — go pick any row in WorkLedger and audit it.

9 COMMENTS

WEEKLY DIGEST⚙ PetrW33

Week 33 — 186 units, first SOX sign-off

accounting/invoices passed its human review lane — the gate held: no agent could promote it alone. Divergence rate 7d: 0.4%.

6 COMMENTS · 1 QUESTION SPUN OFF

POST⚙ FrantaLAST WEEK

Legacy lab: all 33 runtimes boot pinned

Rails 3.2, JRuby 1.7, EOL MySQL — every dead stack now boots as a pinned image in under a minute, so Harness can replay against the real thing.

12 COMMENTS

ARCHIVE

W32Digest — 171 units · deal-catalog publish events reach parity⚙ PETR

W32Decision 0021 published — bankers' rounding for refunds, program-wide⚙ TOMAS

W31Digest — 158 units · delete pass P1 closes: 12% of the estate gone⚙ PETR

W31Harness self-check policy — exit 4 means trust nothing, rerun everything⚙ ROBERT

Get only the news that touches deals — digest lands Monday 9:00.Subscribe

POSTS ARE SIGNED ⚙ BY THE CORE TEAM · QUESTIONS IN COMMENTS SPIN OFF TO Q&A AUTOMATICALLY

02 / CHANGES

Every change, explained

What it means in plain language, who it affects — and open for comment.

#241orders cutover now gated behind parity harnessJUL 18 · AFFECTS: ORDERS · PAYMENTS · FINANCE

WHAT IT MEANS, EXACTLY

Nothing ships to production until replayed traffic matches legacy 1:1. Checkout stays safe for the whole migration — the gate is a database rule, not a promise.

COMMENTS · 2

Dusan — does this delay the gifting port?

⚙ Robert — no; gifting is long-tail lane, unaffected.

#240identity-service retired — users owns identity nowACCOUNTS · 5 COMMENTS→

#239gkb-deploy deleted — 99.96% vendored codePLATFORM · 8 COMMENTS→

#238resque cron jobs become typed queuesJUL 16 · AFFECTS: PLATFORM · ALL SERVICES

WHAT IT MEANS, EXACTLY

Nightly jobs stop silently failing. Every queue is replayable with dead-letter by default — a stuck job becomes a visible row, not a 3am mystery.

COMMENTS · 3

Ales — does the deals nightly export move too?

⚙ Franta — yes, week 36; same schedule, new dead-letter alerts.

#237clo-web + clo-api reunified — one CLO serviceCLO · 4 COMMENTS→

#236orders MySQL shards → one Postgres, reconciliation gate 99.999%ORDERS · SOX · 11 COMMENTS→

#235DRAFTmerchant CSV export retires — replaced by scheduled reportsPROPOSED · COMMENT WINDOW OPEN 41H→

#234ROLLED BACKdeal-image CDN rewrite reverted — parity regressionSEE U-88390 · RETRY W36 · 14 COMMENTS→

#233SUPERSEDEDresque jobs move to sidekiq bridgeREPLACED BY #238

#232SCHEDULEDusers OTP flows cut overLANDS W36 · WED 9:00 · GATED ON PARITY ✓→

241 CHANGES SINCE KICKOFF · STATES: DRAFT → SCHEDULED → LIVE · ROLLED BACK / SUPERSEDED KEPT FOREVER · YOUR SUBSCRIPTIONS (DEALS, ORDERS) FILTER THIS FEED

03 / GLOSSARY · 348 TERMS

Old name → new name

Every entry carries scope, provenance and expiry — stale entries warn before they serve.

voucher-inventory-service (VIS)→inventory

ACTIVE

what changes: JRuby 1.7 → TypeScript · 4 MySQL shards → 1 Postgres

SCOPE: PROGRAM-WIDE · CONFIRMED 07-18 · EXPIRES 10-16

orders /tps API→orders-api

ACTIVE

what changes: Rails 3.2 (frozen 2017) → Encore.ts · same contract, proven by Harness

SCOPE: PROGRAM-WIDE · CONFIRMED 07-15

identity-service→users

MERGED

what changes: the strangler abandoned in 2022, folded into users-service for good

SCOPE: ACCOUNTS · CONFIRMED 07-12

gkb-deploy→∅ deleted

DELETED

what changes: 99.96% vendored code — poster child of delete-first

DECISION 0003 · DELETE PASS P1

VIS3 strangler→inventory (finished)

ACTIVE

what changes: the port abandoned mid-flight — finished in P3, not restarted

SCOPE: PROGRAM-WIDE · CONFIRMED 07-20

clo-web + clo-api→clo

ACTIVE

what changes: the 2019 split reunified · Card-Linked Offers under one service

SCOPE: CLO · CONFIRMED 07-14 · EXPIRES 10-12

resque cron jobs→queues (Encore)

ACTIVE

what changes: Redis-backed resque → typed pub/sub · replayable, dead-letter by default

SCOPE: PLATFORM · CONFIRMED 07-16

orders MySQL shards (4)→postgres · orders

ACTIVE

what changes: one Postgres with row-level tenancy · reconciliation gate 99.999%

SCOPE: ORDERS · SOX LANE · CONFIRMED 07-18

infer-pdf (voucher print)→vouchers/render

MERGED

what changes: PDF generation folded into vouchers · same templates, new renderer

SCOPE: MERCHANT TOOLS · CONFIRMED 07-11

gdoc-service→∅ deleted

DELETED

what changes: zero traffic for 26 months — deleted with its S3 bucket archived

DECISION 0007 · DELETE PASS P1

04 / PUBLIC Q&A

Ask once — the bot answers forever

One human answer is written back to the corpus; every repeat gets it instantly. The FAQ builds itself.

Ask

ATLAS BOT · INSTANTFROM THE CORPUS · 0.4S

▌

"Is VIS still alive? Who owns it?"

ATLAS BOTFROM DECISION 0015

Frozen since 2013, no active owner. Treat as answered — no need to re-ask.

ASKED 4× → MERGED · HUMAN ANSWER: ⚙ TOMAS · CONFIRMED 07-18

"Does /tps keep the same contract after cutover?"

Dusan · merchant tools→ ⚙ TomasSLA 4h · program-wide

1h 12m left

UNANSWERED → ROUTED WITH SLA · THE ANSWER WRITES BACK TO THE CORPUS

"Will merchant voucher PDFs look exactly the same?"

ATLAS BOTFROM CHANGE #235 + ⚙ PETR

Content-identical, pixel-close: same templates on vouchers/render. Print-critical fields are diffed byte-for-byte by Harness.

ASKED 3× → MERGED · CONFIRMED 07-19

"Do I need new credentials for the monorepo tools?"

ATLAS BOTFROM ONBOARDING 002

No. One Google SSO (@groupon.com) covers Atlas, Harness, FleetOps and WorkLedger — roles come from your team.

ASKED 7× → MERGED · ANSWER: ⚙ FRANTA · CONFIRMED 07-17

AUTO-FAQ — TOP THIS WEEK

BUILT BY THE BOT FROM MERGED ASKS

×12Will anything change for customers during the migration?NO — SHADOW TRAFFIC + PARITY GATE

×9When does my team's service cut over?PER-LANE DATES · SEE CHANGES FEED

×7Do I need new credentials for the monorepo tools?NO — ONE GOOGLE SSO

×5Where do old dashboards and reports move?GLOSSARY MAPS EVERY OLD NAME

×4Is VIS still alive? Who owns it?FROZEN 2013 · DECISION 0015

05 / QUESTION STREAMOPEN 9 · BREACHED 1 · ANSWERED TODAY 1

Person · SLA · countdown

Every open question, who it's routed to, and how long until it escalates.

QUESTIONROUTED TOTIME TO ANSWER

Which rounding for refunds over $100 — half-up or bankers’?

ORDERS-ONLY · ×4 ASKS MERGED · FROM U-88412

⚙ Tomas

1h 12m / 4h

Do MBUS shadow-taps cover the Kafka sidecar on VIS?

PROGRAM-WIDE · FROM HARNESS UNVERIFIABLE

⚙ Robert

1h 05m / 3h

Is the voucher print PDF pixel-identical, or just content-identical?

MERCHANT TOOLS · FROM U-88367 · 2 AGENTS BLOCKED

⚙ Petr

3h 11m / 8h

Which team owns the S3 archive of deleted gdoc-service data?

PLATFORM · PUBLIC Q&A · ASKED BY DUSAN

⚙ Franta

4h 36m / 8h

Does the SOX lane sign-off block the whole accounting port or per-unit?

FINANCE · SOX LANE · FROM NEWS COMMENTS

Ales

5h 53m / 8h

Can deals team keep the merchant CSV export after cutover?

DEALS · PUBLIC Q&A · ASKED BY DUSAN

Ales

0h 07m → ESCALATES

BREACHED · Who signs the SOX evidence for invoice rounding?

FINANCE · SLA MISSED 0H 42M AGO · AUTO-ESCALATED TO ⚙ ROBERT + EM

⚙ Robert

−0h 42m · ESCALATED

Is the legacy gifting cron safe to delete? (answered — closing)

ORDERS · ANSWERED BY ⚙ TOMAS IN 0H 51M · 3 AGENTS RESUMED

⚙ Tomas

ANSWERED ✓ 0h 51m

Merchant payout ledger — which currency rounding table applies?

PAYMENTS · PAUSED — WAITING ON LEGAL · SLA CLOCK STOPPED

Dusan

⏸ PAUSED / 8h

Vacation reroute: Petr out — MBUS ownership question rerouted

PLATFORM · REROUTED ⚙ PETR → ⚙ FRANTA · SLA CARRIES OVER

⚙ Franta

2h 17m / 8h

Does deal-image CDN keep legacy URLs? (expired answer re-opened)

DEALS · ANSWER #0009 EXPIRED → RE-ASKED AUTOMATICALLY

Ales

6h 42m / 8h

SLA SCALES WITH BLAST RADIUS — PROGRAM-WIDE 3H · SINGLE-TEAM 8H · DEDUP: 4 ASKS → 1 CANONICAL QUESTION → 1 ANSWER UNBLOCKS ALL

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