Quick Tip: Get Ready for Changes in OneLake Operation Reporting

Check Your Capacity Metrics App

Just a quick heads-up for anyone using the Fabric Capacity Metrics app to monitor OneLake usage.

One of the upcoming features from the Fabric Roadmap I'm watching is OneLake Storage Lifecycle Management Policies. The idea is straightforward: rule-based policies that automatically move data between hot, cool, and cold storage tiers based on last access or modification time. So data you haven't touched in months stops costing you the same as data you query every day.

A recent message in the M365 Admin Center got me thinking (you need an Admin account to access this, or check out this Message Center Archive website instead):

Changes to OneLake operation reporting in Microsoft Fabric
Starting April 1, 2026, Microsoft is rolling out changes to how OneLake compute operations are reported in Fabric. This is tied to the (later) introduction of the mentioned OneLake storage tiers (hot, cool, and cold), and while billing rates are not changing, the way operations appear in your dashboards and reports is.

So what is changing?

The following changes are being applied:

• Operation names now include the storage tier. "OneLake Read via Proxy" becomes "OneLake Read (Hot)", for example.
• Proxy and Redirect operations are consolidated under a single operation name. No billing impact, but the names you're used to will disappear.
• Operations are now grouped by workspace in the Capacity Metrics app, under a new OneLake item. So plan for workspace-level reporting. If you rely on item-level operation details in the Capacity Metrics app, you'll have to use OneLake diagnostics going forward.

Units of measure and consumption rates stay the same, so no surprises on the bill.

A preview of how the reporting in the Metrics app will look like:

 

What should you do before April 1?

This change is rolling out in phases:

• Operation name changes start April 1
• Consolidation and Metrics app updates follow in the next weeks. Keep an eye on your tenant.

Steps you should take:

• Check if you have any custom reports, dashboards, or scripts that reference OneLake operation names, update those to match the new naming convention (think FUAM or others)
• If you rely on item-level operation detail in the Capacity Metrics app, set up OneLake diagnostics now so you don't lose visibility
• Share this with your helpdesk or anyone on your team who monitors capacity or cost analytics

You can find more details in the OneLake compute consumption documentation and track the rollout via the Microsoft 365 Message Center (MC1259829).