Expose eager activity reservation limit

CHANGELOG.md

@@ -19,6 +19,12 @@ to docs, or any other relevant information.
 
 ## [Unreleased]
 
+### Added
+
+- Added the `Temporalio::Worker` `max_eager_activity_reservations_per_workflow_task:` option to
+  configure the number of activity slots reserved for eager execution per workflow task. Values
+  must be positive; use `disable_eager_activity_execution: true` to disable eager execution.
+
 ### Breaking Changes
 
 - By default, workers now proactively validate outbound payload/memo sizes before sending: a field

temporalio/ext/src/worker.rs

@@ -544,6 +544,9 @@ fn build_config(options: Struct, runtime_handle: &RuntimeHandle) -> Result<Worke
         .maybe_max_task_queue_activities_per_second(
             options.member::<Option<f64>>(id!("max_task_queue_activities_per_second"))?,
         )
+        .max_eager_activity_reservations_per_workflow_task(
+            options.member(id!("max_eager_activity_reservations_per_workflow_task"))?,
+        )
         .graceful_shutdown_period(Duration::from_secs_f64(
             options.member(id!("graceful_shutdown_period"))?,
         ))