---
slug: "azure-monitor-container-insights-legacy-authentication-retirement"
title: "Azure Monitor: Container Insights legacy authentication retirement"
summary: "Retirement date for legacy authentication in Azure Monitor Container Insights: 30 Sep 2026. Clusters that use it must move to Managed Identity authentication."
cloud: "azure"
service: "Azure Monitor"
service_slug: "monitor"
category: "feature"
type: "retirement"
announced_date: "2025-10-07"
effective_date: "2026-09-30"
effective_precision: "day"
replacement: "Managed Identity authentication"
affected_versions: []
source_url: "https://azure.microsoft.com/updates?id=500853"
extra_source_urls: ["https://aka.ms/CILegacyAuthMigration"]
vendor_ref: "500853"
last_checked_at: "2026-11-12T09:55:19.345Z"
created_at: "2026-11-13T13:36:44.208Z"
updated_at: "2026-11-13T13:36:44.208Z"
url: "https://eolwatch.dev/items/azure-monitor-container-insights-legacy-authentication-retirement"
short_url: "https://eolwatch.dev/i/16"
markdown_url: "https://eolwatch.dev/items/azure-monitor-container-insights-legacy-authentication-retirement.md"
json_url: "https://eolwatch.dev/items/azure-monitor-container-insights-legacy-authentication-retirement.json"
source_note: null
---

# Azure Monitor: Container Insights legacy authentication retirement

Retirement date for legacy authentication in Azure Monitor Container Insights: 30 Sep 2026. Clusters that use it must move to Managed Identity authentication.

- Effective date: 30 Sep 2026
- Cloud: [Azure](https://eolwatch.dev/cloud/azure.md)
- Service: [Azure Monitor](https://eolwatch.dev/services/azure/monitor.md)
- Type: Retirement
- Category: [Feature](https://eolwatch.dev/categories/features.md)
- Replacement: Managed Identity authentication
- Announced: 7 Oct 2025
- Official source: [azure.microsoft.com](https://azure.microsoft.com/updates?id=500853)
- Last checked: 12 Nov 2026

## What breaks

Legacy authentication in Container Insights is retired on 30 Sep 2026. Clusters that still use legacy authentication are affected and must be migrated to Managed Identity authentication. Syslog collection and High Scale mode are available only with Managed Identity.

## What to do

1. Migrate each cluster to Managed Identity authentication before 30 Sep 2026.
2. Use the single-click migration in the Azure portal, or the command line options and bulk migration script in the Azure Monitor documentation.
3. Follow the [migration guidance](https://aka.ms/CILegacyAuthMigration).

## Replacement

Managed Identity authentication

## Sources

- [Official source](https://azure.microsoft.com/updates?id=500853) (azure.microsoft.com, Official)
- [Additional source](https://aka.ms/CILegacyAuthMigration) (aka.ms, Official)

Last checked against the first source in this list on 12 Nov 2026.

Page: https://eolwatch.dev/items/azure-monitor-container-insights-legacy-authentication-retirement | JSON: https://eolwatch.dev/items/azure-monitor-container-insights-legacy-authentication-retirement.json

The text on this page is drafted with AI assistance from the vendor's text, checked against the official source and approved by a person before it is published.