Go SDK Changelog File — Temporal

User metadata fields (StaticSummary, StaticDetails, CurrentDetails, Activity Summary, Timer Summary, AwaitOptions) are no longer marked as experimental.

Automatically enroll workers into poller autoscaling when the namespace advertises the PollerAutoscalingAutoEnroll capability. This only applies to poller types left at their default (i.e. the worker set neither MaxConcurrent<Type>TaskPollers nor <Type>TaskPollerBehavior); explicitly configured pollers are left unchanged.
Added worker.Options.PreferredVersionProvider, which can select the version recorded by a newly encountered workflow.GetVersion call. This supports gradual rollout of a new GetVersion call before activating its new behavior.

Allow query results to use external storage before payload size enforcement.
Correct schedule catch-up window documentation to state that an unset value is omitted and the server applies its one-year default.
Resource-based tuner: ReserveSlot now honors context cancellation while the resource controller is declining slots. Previously the retry loop observed the context only while the ramp throttle was making the caller wait, so a poller goroutine could outlive worker shutdown, keeping the worker's stop WaitGroup from draining and continuing to sample system resources for the life of the process.
Resource-based tuner: TryReserveSlot (used for eager task dispatch) no longer blocks for up to RampThrottle while a concurrent ReserveSlot waits out the ramp throttle. The throttle behavior is unchanged; only the unnecessary lock contention on the eager path is removed.

Respect SDK flags already recorded in workflow history even when GetSystemInfo does not report SDK metadata support.
Only treat GetSystemInfo UNIMPLEMENTED responses as missing server capability support when the error indicates an unknown method.
Retry server RPCs without gzip compression when a method reports that gzip decompression is unsupported, while continuing to use gzip for other methods.
Populate Priority on ScheduleWorkflowAction values returned by ScheduleHandle.Describe().
Report the configured deadlock detection timeout in potential deadlock errors instead of always saying "over a second".
Register all poller types before starting autoscaling pollers to avoid an autoscaling worker startup race.
Treat workflow.SideEffectWithOptions and workflow.MutableSideEffectWithOptions as valid deterministic wrappers in workflowcheck.

Added OneTimeVersioningOverride support for workflow start and workflow execution options, allowing a workflow to route to a target Worker Deployment Version until one Workflow Task completes there.
Nexus operation link propagation for signals. When a Nexus operation handler signals a workflow (including signal-with-start), the inbound Nexus request links are now forwarded onto the signaled workflow so its history events link back to the caller, and the link the server returns for the signaled event is attached to the caller workflow's Nexus operation history event. This makes the caller and callee mutually navigable in the UI for signal-based Nexus operations.
Support propagating standalone Nexus operation links.
OpenTelemetry tracing support for standalone activities started from the client.
Doclink now links interfaces when they're re-exported from private to a public package.

User metadata fields (StaticSummary, StaticDetails, CurrentDetails, Activity Summary, Timer Summary, AwaitOptions) are no longer marked as experimental.

Automatically enroll workers into poller autoscaling when the namespace advertises the PollerAutoscalingAutoEnroll capability. This only applies to poller types left at their default (i.e. the worker set neither MaxConcurrent<Type>TaskPollers nor <Type>TaskPollerBehavior); explicitly configured pollers are left unchanged.
Added worker.Options.PreferredVersionProvider, which can select the version recorded by a newly encountered workflow.GetVersion call. This supports gradual rollout of a new GetVersion call before activating its new behavior.

Allow query results to use external storage before payload size enforcement.
Correct schedule catch-up window documentation to state that an unset value is omitted and the server applies its one-year default.
Resource-based tuner: ReserveSlot now honors context cancellation while the resource controller is declining slots. Previously the retry loop observed the context only while the ramp throttle was making the caller wait, so a poller goroutine could outlive worker shutdown, keeping the worker's stop WaitGroup from draining and continuing to sample system resources for the life of the process.
Resource-based tuner: TryReserveSlot (used for eager task dispatch) no longer blocks for up to RampThrottle while a concurrent ReserveSlot waits out the ramp throttle. The throttle behavior is unchanged; only the unnecessary lock contention on the eager path is removed.

Respect SDK flags already recorded in workflow history even when GetSystemInfo does not report SDK metadata support.
Only treat GetSystemInfo UNIMPLEMENTED responses as missing server capability support when the error indicates an unknown method.
Retry server RPCs without gzip compression when a method reports that gzip decompression is unsupported, while continuing to use gzip for other methods.
Populate Priority on ScheduleWorkflowAction values returned by ScheduleHandle.Describe().
Report the configured deadlock detection timeout in potential deadlock errors instead of always saying "over a second".
Register all poller types before starting autoscaling pollers to avoid an autoscaling worker startup race.
Treat workflow.SideEffectWithOptions and workflow.MutableSideEffectWithOptions as valid deterministic wrappers in workflowcheck.

Added OneTimeVersioningOverride support for workflow start and workflow execution options, allowing a workflow to route to a target Worker Deployment Version until one Workflow Task completes there.
Nexus operation link propagation for signals. When a Nexus operation handler signals a workflow (including signal-with-start), the inbound Nexus request links are now forwarded onto the signaled workflow so its history events link back to the caller, and the link the server returns for the signaled event is attached to the caller workflow's Nexus operation history event. This makes the caller and callee mutually navigable in the UI for signal-based Nexus operations.
Support propagating standalone Nexus operation links.
OpenTelemetry tracing support for standalone activities started from the client.
Doclink now links interfaces when they're re-exported from private to a public package.