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@vealumalai vealumalai released this 28 Apr 19:19
v1.3.70
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AIO2604 (v1.3.70) Public Release Notes

Release date: April 2026

Release type: Patch

Current GA version: 2604 · Version history

Azure IoT Operations (AIO) 2604 is a stability and security-focused release that delivers vulnerability remediation across multiple components, MQTT connector reliability and health reporting improvements, OPC UA connector health state consistency, dataflow stability fixes, and new portal and tooling capabilities.

Release Highlights

  • MQTT connector health status improvements: The MQTT connector now surfaces richer health status signals for assets and endpoints, improving operational visibility and enabling faster diagnosis of connectivity issues.

  • Data Flow extension for VSCode now generally available: The VS Code extension for building third-party WebAssembly transforms is now GA, enabling developers to author and test custom data transformation modules directly from VS Code.

  • Resource status in Azure Portal and CLI: AIO and Azure Device Registry resource health status is now visible in the Azure IoT Operations Experience, Azure Portal, and CLI, giving operators a unified view of resource state across cloud and edge.

  • Dataflow graph startup reliability: Fixed a race condition that could prevent dataflow graphs from starting on busy clusters, improving deployment reliability in high-density environments.

  • Security vulnerability remediation: Addressed High and Critical security vulnerabilities across Akri, Schema Registry, AIO Observability, and OpenTelemetry SDK components.

Upgrade recommended if you rely on MQTT connectors, OPC UA connectors, dataflow graphs, or health monitoring — this release delivers critical connector stability fixes, improved health reporting, and security patches.

Upgrade to 2604 from any supported GA version to ensure you receive the latest security patches and reliability enhancements. Staying current is recommended for continued support and reliability.

Components Overview

Dataflows

Fixes

  • Dataflow graph startup race condition: Fixed an issue where dataflow graphs could fail to start under certain race conditions on busy clusters, which could result in timed-out commands and failed pipeline execution. Dataflow graphs now start reliably regardless of cluster load.

  • Client-side retries for transient failures: Fixed an issue where dataflows lacked client-side retry logic, which could cause them to hang indefinitely on transient failures. Dataflows now include retry logic to recover gracefully from transient errors without requiring manual intervention, improving overall messaging reliability.

Connectors

OPC UA

Fixes

  • Health state retransmission: Fixed an issue where the OPC UA connector did not periodically retransmit the last known health state for assets and devices, which could cause resources to fall to Unknown status after 5 minutes of stable operation. The connector now retransmits health state every 5 minutes, ensuring that healthy assets and devices maintain accurate status reporting.

MQTT

Fixes

  • Health status reporting improvements: The MQTT connector now surfaces improved health status signals for assets and endpoints, providing operators with more accurate and timely visibility into connector health and connectivity state.

  • Connector initialization timeout: Fixed an issue where the timeout for loading a transform graph to the connector was insufficient, which could cause dataset processing to fail.

  • Asset discovery with numeric identifiers: Fixed an issue where the MQTT connector failed to discover assets when the asset-level identifier derived from MQTT topics started with a digit (common with MAC address-based identifiers), which could prevent assets from being onboarded. The connector now correctly handles identifiers that begin with numeric characters. Connector version 2.0.0 is now available with this fix.

Azure IoT Operations Experience

New features

  • Resource status visibility: AIO and Azure Device Registry resource status is now surfaced in the Azure IoT Operations Experience, Azure Portal, and CLI, enabling operators to view resource health and operational state directly from cloud management surfaces.

Security

Fixes

  • Vulnerability remediation: Addressed security vulnerabilities across multiple components, including Akri, Schema Registry, and AIO Observability.
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