How does `ignore_errors` for all tasks interact with a task's `failed_when` condition?

The `failed_when` condition is evaluated *before* `ignore_errors`. If a task's result meets the `failed_when` criteria, the task is marked as 'failed' internally. However, if `ignore_errors: true` is set at the play level (or for that specific task), this 'failure' status will then be disregarded by Ansible's playbook execution logic, allowing the playbook to continue to the next task. In essence, `failed_when` determines *if* a task failed based on its output, and `ignore_errors` determines *what happens next* if it failed, preventing the playbook from halting.