> ## Documentation Index
> Fetch the complete documentation index at: https://docs.cognite.com/llms.txt
> Use this file to discover all available pages before exploring further.

# Monitor Fabric OneLake transformations

> Check OneLake rows and bytes read for Transformations jobs that use ext_onelake.

<Warning>
  The features described in this article are in [public preview](/cdf/product_feature_status#public-preview) and may change.
</Warning>

After a transformation that uses `ext_onelake` runs, review metrics in Cognite Data Fusion.

## View Run history

1. Open **Transformations**.
2. Open the transformation.
3. Select **Run history**.

For OneLake reads, Run history can show metrics such as:

* `onelake.<source>.<table>.rows.read`
* `onelake.<source>.<table>.bytes.read`

You also see the usual transformation upsert and job status metrics.

## What not to expect

Volume, concurrency, and throttling limits for this path are Cognite-managed. If jobs hit enforced defaults, contact Cognite Support. Do not look for customer-facing concurrency or executor dashboards for OneLake.

## Further reading

* [Read Fabric OneLake data in transformations](/cdf/integration/guides/transformation/read_fabric_onelake)
* [Troubleshoot Fabric OneLake in Transformations](/cdf/integration/guides/transformation/troubleshoot_fabric_onelake)
* [Troubleshooting transformations](/cdf/integration/guides/transformation/troubleshooting)