Yevhenii Shcherbina 0bc2858b6e feat: report unpriced AI models to owners (#28419)
Closes
[AIGOV-568](https://linear.app/codercom/issue/AIGOV-568/notify-admins-about-unpriced-ai-models).

AI Bridge records token usage for a model with no price at a NULL cost,
so its spend is neither reported nor enforced against any budget. Until
now that only reached admins through an info log and a Prometheus
metric.

Owners now receive a weekly report listing models used without a price
in the past week. The report links to documentation explaining how Coder
calculates spend from the default price book and how owners can
configure missing prices with `coder exp ai-model-prices`.

## Screenshots

<img width="726" height="531" alt="image"
src="https://github.com/user-attachments/assets/168ae378-60cb-4c96-8f60-36c6edc0b268"
/>
<img width="470" height="417" alt="image"
src="https://github.com/user-attachments/assets/7dc71a1e-0c57-44f1-86f7-df800603c865"
/>



## Design

**Derived, not tracked.** The unpriced set is computed at report time
from interceptions that recorded token usage, joined against the current
`ai_model_prices` table. Requests that produced no token usage are
excluded.

**No new loop or table.** `reportUnpricedAIModels` is a sibling of
`reportFailedWorkspaceBuilds` in the existing report generator, reusing
its ticker and `notification_report_generator_logs`. Each report runs in
its own transaction under a separate advisory lock, so failures and lock
contention do not couple otherwise independent reports. The weekly
frequency is enforced by the persisted timestamp rather than by the
ticker, which restarts with the process and runs on a different phase in
each replica.

## Behaviour

| Situation | Outcome |
|---|---|
| Model used without a price | Listed in the next weekly report |
| Price set | Disappears from the next report |
| Still unpriced and still in use | Reported again each week |
| Model stops being used | Drops out of the report |
| Nothing unpriced | No notification; window still advances |
| More than 100 unpriced models | Top 100 by usage, with the total
reported alongside |
| openai-compat models | Excluded, they cannot be priced |
| Many replicas | Exactly one report per week |
| First ever run | Reports models used in the preceding week immediately
|

## Design choices

1. **openai-compat** is excluded because it cannot be priced and would
produce permanent, unactionable notifications.
2. **Token volume** orders the list but is not shown. The 100-model cap
therefore prioritizes models responsible for the most unpriced usage.
3. **Placement** remains in the generic report generator rather than
`aibridgedserver`. This keeps one periodic-report lifecycle at the cost
of coupling the notifications package to an AI cost-control query.
4. **No license gate.** The reporter runs even when AI Gateway is
disabled. With no recorded token usage the query is empty and no
notification is sent.

---

Created by Coder Agents on behalf of @evgeniy-scherbina.
2026-08-27 21:04:13 +00:00

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