[Open Data] Add instance size flexibility dataset from Azure Catalogs API

.github/workflows/opendata-instance-size-flexibility.yml

@@ -0,0 +1,84 @@
+name: Update Instance Size Flexibility
+
+on:
+  schedule:
+    - cron: '0 6 * * 1'  # Every Monday at 06:00 UTC
+  workflow_dispatch:
+
+# Unlike the other open data workflows, the Catalogs API is authenticated and requires
+# Microsoft.Capacity/catalogs/read. This reuses the existing OIDC service principal from the
+# aoe-prod environment (same one the AOE deployment workflows use) via federated credentials,
+# so no client secret is stored. The principal's subscription must have the Microsoft.Capacity
+# resource provider registered.
+permissions:
+  contents: write
+  pull-requests: write
+  id-token: write
+
+jobs:
+  update:
+    environment: aoe-prod
+    runs-on: ubuntu-latest
+    timeout-minutes: 60
+    steps:
+      - uses: actions/checkout@v4
+        with:
+          ref: dev
+
+      - name: Install Az.Accounts
+        shell: pwsh
+        run: |
+          Set-PSRepository PSGallery -InstallationPolicy Trusted
+          Install-Module -Name Az.Accounts -RequiredVersion 2.19.0 -Force
+
+      - name: Login via Az module
+        uses: azure/login@hf_447_release
+        with:
+          client-id: ${{ secrets.AZURE_CLIENT_ID }}
+          tenant-id: ${{ secrets.AZURE_TENANT_ID }}
+          subscription-id: ${{ secrets.AZURE_SUBSCRIPTION_ID }}
+          enable-AzPSSession: true
+
+      - name: Fetch ISF ratios from Azure Catalogs API
+        shell: pwsh
+        run: src/scripts/Update-InstanceSizeFlexibility.ps1
+
+      - name: Create PR if data changed
+        env:
+          GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+          PR_BODY: |
+            ## Summary
+
+            Weekly automated update of instance size flexibility (ISF) ratios from the
+            [Azure Reservations Catalogs API](https://learn.microsoft.com/azure/cost-management-billing/reservations/instance-size-flexibility#extract-instance-size-flexibility-ratios-using-azure-catalogs-api).
+
+            This file maps each ARM SKU to its instance size flexibility group and ratio,
+            replacing the deprecated `AutofitComboMeterData.csv` and `isfratioblob.csv` files
+            that were hosted on `ccmstorageprod.blob.core.windows.net` (retired 30 Aug 2026).
+
+            ## Test plan
+
+            - [ ] Review the diff for unexpected changes (large drops in group/SKU count, etc.)
+            - [ ] Spot-check a few SKUs against the Azure Pricing Calculator
+
+            🤖 Generated by the **Update Instance Size Flexibility** workflow
+        run: |
+          # Check for changes (handles both new file and modified file)
+          if git diff --quiet --exit-code -- src/open-data/InstanceSizeFlexibility.csv 2>/dev/null && \
+             ! git ls-files --others --exclude-standard | grep -q 'InstanceSizeFlexibility.csv'; then
+            echo "No changes detected"
+            exit 0
+          fi
+
+          BRANCH="opendata/instance-size-flexibility-$(date +%Y%m%d)"
+          git checkout -b "$BRANCH"
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git add src/open-data/InstanceSizeFlexibility.csv
+          git commit -m "chore: Update instance size flexibility ratios"
+          git push origin "$BRANCH"
+
+          gh pr create \
+            --title "[Open Data] Update instance size flexibility ratios ($(date +'%B %Y'))" \
+            --base dev \
+            --body "$PR_BODY"

docs-mslearn/toolkit/changelog.md

@@ -3,7 +3,7 @@ title: FinOps toolkit changelog
 description: Review the latest features and enhancements in the FinOps toolkit, including updates to FinOps hubs, Power BI reports, and more.
 author: MSBrett
 ms.author: brettwil
-ms.date: 06/19/2026
+ms.date: 06/29/2026
 ms.topic: reference
 ms.service: finops
 ms.subservice: finops-toolkit
@@ -18,14 +18,18 @@ ms.reviewer: brettwil
 
 This article summarizes the features and enhancements in each release of the FinOps toolkit.
 
-<!--
 <br>
 
 ## Unreleased
 
 The following section lists features and enhancements that are currently in development.
 
--->
+### [Open data](open-data.md) updates
+
+**[Instance size flexibility](open-data.md#instance-size-flexibility)**
+
+- **Added**
+  - Added a new [Instance size flexibility](open-data.md#instance-size-flexibility) dataset that maps each ARM SKU to its instance size flexibility group and ratio, sourced from the Azure Reservations Catalogs API. It replaces the deprecated ISF ratio files hosted on `ccmstorageprod.blob.core.windows.net` ([#2090](https://github.com/microsoft/finops-toolkit/issues/2090)).
 
 <br><a name="latest"></a>
 

docs-mslearn/toolkit/open-data.md

@@ -4,7 +4,7 @@ description: Use open data to normalize and enhance your FinOps reporting, ensur
 ms.topic: concept-article
 author: flanakin
 ms.author: micflan
-ms.date: 04/04/2026
+ms.date: 06/29/2026
 ms.service: finops
 ms.subservice: finops-toolkit
 ms.reviewer: micflan
@@ -179,6 +179,31 @@ A few important notes about the data:
 
 <br>
 
+## Instance size flexibility
+
+Instance size flexibility (ISF) lets a reservation apply across multiple SKUs in the same flexibility group, weighted by a ratio. The instance size flexibility file maps each ARM SKU to its flexibility group and ratio, sourced from the [Azure Reservations Catalogs API](/azure/cost-management-billing/reservations/instance-size-flexibility#extract-instance-size-flexibility-ratios-using-azure-catalogs-api). It replaces the static ISF ratio files that were previously hosted on `ccmstorageprod.blob.core.windows.net`, which Microsoft is retiring.
+
+Sample data:
+
+| InstanceSizeFlexibilityGroup | ArmSkuName     | Ratio |
+| ---------------------------- | -------------- | ----- |
+| Av2 Series                   | Standard_A1_v2 | 1     |
+| Av2 Series                   | Standard_A2_v2 | 2.1   |
+| Av2 Series                   | Standard_A4_v2 | 4.44  |
+
+A few important notes about the data:
+
+- It covers the reserved resource types that expose ISF ratios: Virtual Machines, Block Blob storage, Redis Cache, and Dedicated Host.
+- Ratios are the raw Microsoft values within each group (the smallest SKU isn't always `1`).
+- Data is updated weekly via a GitHub Actions workflow.
+
+<!-- prettier-ignore-start -->
+> [!div class="nextstepaction"]
+> [Download](https://github.com/microsoft/finops-toolkit/releases/latest/download/InstanceSizeFlexibility.csv)
+<!-- prettier-ignore-end -->
+
+<br>
+
 ## Dataset examples
 
 The following files are examples of what you see when you export data from Microsoft Cost Management. These files are provided to help you understand the data structure and format. They are from an Enterprise Agreement (EA) demo account and aren't intended to be used for ingestion or reporting.

docs/open-data.md

@@ -34,6 +34,12 @@ FinOps toolkit open data is used to transform Cost Management actual and amortiz
 ## Download open data
 
 <div class="ftk-gallery">
+    <div class="ftk-tile">
+        <div>📐 Instance size flexibility</div>
+        <a class="btn mb-4 mb-md-0 mr-4" href="https://github.com/microsoft/finops-toolkit/releases/latest/download/InstanceSizeFlexibility.csv">Download</a>
+        <a class="btn mb-4 mb-md-0 mr-4" href="" style="visibility:hidden; width:100px">&nbsp;</a>
+        <a class="btn mb-4 mb-md-0 mr-4" href="" style="visibility:hidden; width:100px">&nbsp;</a>
+    </div>
     <div class="ftk-tile">
         <div>📏 Pricing units</div>
         <a class="btn mb-4 mb-md-0 mr-4" href="https://github.com/microsoft/finops-toolkit/releases/latest/download/PricingUnits.csv">Download</a>