[Update] .NET 10 Servicing: March 2026 Release Details

The March 2026 Servicing Update for .NET 10 has landed, addressing several critical performance regressions in the Tiered PGO (Profile-Guided Optimization) subsystem. Developers have reported significant memory pressure in long-running ASP.NET Core services, which this release mitigates through improved GC collection cycles.

JIT Optimization: The "Ghost Leak" Fix

The primary technical fix involves a JIT (Just-In-Time) compiler edge case where dynamic method signatures were failing to be evicted from the internal cache. This "Ghost Leak" resulted in a slow linear climb in non-paged pool memory. The SDK 10.0.402 runtime now includes a revised eviction policy for DynamicMethod handles.

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Agentic Observability Hooks

New in this release are OpenTelemetry native hooks for Semantic Kernel integration. These hooks allow for sub-millisecond tracing of agent reasoning steps directly within the .NET Runtime diagnostic pipe, providing unprecedented visibility into autonomous service behavior.