- Introduced the alpha `MutableSchedulingDirectivesForSuspendedJobs` feature gate (disabled by default), which allows mutating a Job's scheduling directives while the Job is suspended. 
  It also updates the Job controller to clears the `status.startTime` field for suspended Jobs. ([#135104](https://github.com/kubernetes/kubernetes/pull/135104), [@mimowo](https://github.com/mimowo)) [SIG Apps and Testing]

    Thread.class.getMethod("resume").invoke(thread);
    thread.join();
    // It's possible to race and suspend the thread just before the park call actually takes effect,
    // causing the thread to be suspended for 3.5 seconds, and then park itself for 2 seconds after
    // being resumed. To avoid a flake in this scenario, calculate how long that thread actually

    Thread.class.getMethod("resume").invoke(thread);
    thread.join();
    // It's possible to race and suspend the thread just before the park call actually takes effect,
    // causing the thread to be suspended for 3.5 seconds, and then park itself for 2 seconds after
    // being resumed. To avoid a flake in this scenario, calculate how long that thread actually

- Fix the bug which could result in Job status updates failing with the error:
  status.startTime: Required value: startTime cannot be removed for unsuspended job
  The error could be raised after a Job is resumed, if started and suspended previously. ([#135129](https://github.com/kubernetes/kubernetes/pull/135129), [@dejanzele](https://github.com/dejanzele)) [SIG Apps and Testing]

- Fix the bug which could result in Job status updates failing with the error:
  status.startTime: Required value: startTime cannot be removed for unsuspended job
  The error could be raised after a Job is resumed, if started and suspended previously. ([#135130](https://github.com/kubernetes/kubernetes/pull/135130), [@dejanzele](https://github.com/dejanzele)) [SIG Apps and Testing]

- Fix the bug which could result in Job status updates failing with the error:
  status.startTime: Required value: startTime cannot be removed for unsuspended job
  The error could be raised after a Job is resumed, if started and suspended previously. ([#135128](https://github.com/kubernetes/kubernetes/pull/135128), [@dejanzele](https://github.com/dejanzele)) [SIG Apps and Testing]