# Monthly technical usage observations

After each provider billing period, add `YYYY-MM.json` conforming to
`schemas/monthly-resource-observation.schema.json` with
`record_type: usage_observation`. These records contain technical and labor
observations. Authoritative booked financial actuals come from fin-hub and are
referenced during reconciliation rather than copied into a second ledger.
Set `forecast_ref` to the forecast file used for the decision. Evidence should
identify, without secrets, the provider usage export/invoice, PostgreSQL/CNPG
measurement, restore drill, and internal time record.

Required proxies are database GB, provider stored GB, WAL GB, restore egress,
write/read requests, infrastructure invoice cost, internal labor hours/cost,
and total cost. Also capture backup success, maximum observed RPO, and restore
RTO when available.

Run:

```bash
make variance ACTUAL=data/actuals/YYYY-MM.json
```