Patch release with fixed regressions from 1.8.15, safe defaults for the Newtonsoft.Json package when previous versions are used and project-related tunings to speed up the build pipeline.

Hangfire.Core

• Changed – Include fewer stack frames in exceptions come from IServerFilter implementations.
• Changed – Don’t include file information in the ExceptionDetails property of a FailedState instance.
• Changed – Switch back to CancellationEvent usage instead of CancellationToken.WaitHandle.
• Fixed – Don’t commit external transaction in the BackgroundJobStateChanger implementation.
• Fixed – Use safe default serializer settings for Newtonsoft.Json 12.X and below.
• Project – Fix builds for the net451 platform when using .NET 9.0.
• Project – Significantly reduce execution time of unit tests in the RecurringJobSchedulerFacts class.
• Project – Bump Microsoft.CodeAnalysis.NetAnalyzers package to version 9.0.0.

Hangfire.SqlServer

• Changed – Use vanilla ADO.NET when fetching a job in the SqlServerJobQueue implementation.
• Changed – Decrease the LockTimeout time when calling the sp_getapplock procedure to 1 second for less blocking.
• Fixed – SqlException: Must declare the scalar variable “key” in delayed and recurring job schedulers.
• Project – Disable parallel tests execution when building under .NET 9.0.
• Project – Run tests over the latest Microsoft.Data.SqlClient package and the net6.0 platform.
• Project – Reduce execution time of integration tests.
• Project – Disable PoolBlockingPeriod setting on AppVeyor to handle transient test failures.