Function report_problem 

pub async fn report_problem(
    state: &mut RunState,
    pr_url: Option<&str>,
    version: Option<&str>,
    reason: &str,
)

Make a post-merge problem visible: record it, comment on the release pull request, raise a notification and run the configured notifier. Every step is best-effort - a failed comment or webhook is an event, never a reason to lose the record or the run.