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Learn · Reliability

Data freshness monitoring

How to know a table went quiet before a dashboard lies.

The problem

Dashboards still render when the source table stops updating. The failure is quiet — until a meeting goes sideways.

The outcome

Set per-table freshness SLAs on BigQuery last-modified metadata, alert once when lag crosses the line, and show blast radius to downstream KPIs.

SLA hours

You define per table

Metadata

INFORMATION_SCHEMA

1 alert

Per root cause

What you get

Pick KPI tables first

Start with marts leadership opens every Monday — not every staging model.

Set warning and critical

e.g. warn at 12h, critical at 24h — numbers you can put in a runbook.

Group by root cause

One stale source should not page for every child dashboard.

Prove it in demo

Replay a 3-day-stale orders table in /app.

Try VectorData, then decide

Open workspace, or book a Data Stack Health Audit credited toward Managed.