Batch stuck in queued

Normal

• Large batches queue behind a render fleet that scales up on demand; the first rows can take a couple of minutes to appear.
• A stalled state means nothing has moved for a while; it resumes on its own when the fleet catches up.

Not normal

• No progress after 15 minutes on a small batch.
• done climbing but every row failing.

In both cases tell us with the batch id. Credits for rows that never render are returned when the batch is cancelled.