In action log it is possible to filter by status. One of which is "In progress". There are two ways action can be in progress. It is a "new" action or "not sent" when first try failed and it is currently retrying. In case action is still "new" and filtering is set by "In progress", there will be no results. Action log filtering by "In progress" only searches the data for ALERT_STATUS_NOT_SENT (0), but sometimes alerts can have status ALERT_STATUS_NEW (3). The moment may be brief, but still.