AWS orchestrates a broad cleanup of its modernization services.
Migration Hub and Application Discovery Service have been placed in maintenance mode. For the moment until November 7, 2025, they will no longer accept new customers*. The same will apply at this deadline to the .NET modernization tools**. Meanwhile, Mainframe Modernization Service will exist only in a self-managed version.
The designated stopgap, launched a few months ago under the banner of agentic AI, is called AWS Transform.
A number of other services will enter maintenance mode starting November 7, 2025. Here are a few of them.
Amazon Cloud Directory
A hierarchical data store, an alternative to LDAP directories. Writes will be blocked in a second phase (after April 22, 2026). Then the service will shut down on September 30, 2026, and the content will be deleted in parallel. AWS has not added features since 2018 and the launch of Amazon Neptune, a graph-oriented database toward which it now recommends migrating.
Amazon CodeCatalyst
From November 7, existing users will no longer be able to create new workspaces. AWS suggests migrating to the GitLab Duo with Amazon Q offering, or to CodeBuild (code compilation and testing), CodePipeline (CI/CD orchestration), CodeDeploy (application deployment) and CodeArtifact (package management).
Amazon CodeGuru Reviewer
Code-analysis service for Java and Python on Bitbucket, CodeCommit, GitHub and S3). From November 7, 2025, it will no longer be possible to create new repository associations. Recommended migration options: Amazon Q Developer and Amazon Inspector, which cover both GitHub and GitLab.
Amazon S3 Object Lambda
This service allows injecting code into S3 GET, HEAD and LIST requests to modify data. It will stop accepting new users on the same date. AWS recommends invoking Lambda by other means (via CloudFront, API Gateway or function URLs) or processing data in client applications.
Amazon Glacier
The maintenance transition for Amazon Glacier will occur a little later. On December 15, 2025, specifically. The service originated as a standalone vault-based REST API. Data stored there will remain accessible indefinitely, AWS assures, which recommends transitioning to Glacier storage classes in S3. These have the advantage of broader availability across its cloud, integration with its other services, lower cost and a bucket-level API.
AWS IoT SiteWise Monitor and Data Processing Pack
Two components of the AWS IoT SiteWise offering will also move into maintenance mode on November 7, 2025. On one hand, the Data Processing Pack (transformation, storage and visualization of data). On the other, Monitor (creating web portals to visualize and share data within an organization). To replace the former, AWS recommends either open-source options (Node-RED for transformation, InfluxDB for time-series storage, Grafana for visualization), or partner solutions (CloudRail, EasyEdge, Litmus Edge). For the latter, it suggests substituting the Amazon Managed Grafana plug‑in (noting there is no asset-level access control nor integration with AWS IoT SiteWise Assistant) or Grafana Cloud or self-hosted Grafana.
AWS Snowball Edge
Data transfer appliances. The offering will also stop accepting new customers as of November 7, 2025. Recommended successors: DataSync for network-based transfers and Data Transfer Terminal for physical transfers (Seagate and Tsecond are also cited). To replace the compute-optimized appliance, there is possibly AWS Outposts.
Amazon Fraud Detector
Fraud detection based on machine learning. As a replacement, AWS points to its WAF (web application firewall), its SageMaker service (MLOps)… and an open-source library it originated: AutoGluon (AutoML for images, text, time series and tabular data).
Web access to Amazon WorkSpaces on PCoIP
AWS recommends installing, if possible, the Amazon WorkSpaces clients. Otherwise, migrate to the DCV protocol. Which has, among other advantages:
- Better performance
- Additional features (SAML and certificate-based authentication, notably)
- Wider availability (no web access on PCoIP in some AWS regions, including Paris)
- Management of Linux desktops in addition to Windows
- Operation in Edge and Safari in addition to Chrome and Firefox
- Multi-monitor support and host-side GPU management
* On Migration Hub as on Application Discovery Service and Mainframe Modernization Service, ongoing projects will be carried to completion.
** This includes Porting Assistant for .NET, AWS App2Container, AWS Toolkit for .NET Refactoring and AWS Microservice Extractor for .NET.
