Analytics areas
Key metrics at a glance
Deliveryqueued_count: emails waiting to be dispatchedsent_count: accepted by the providerfailed_count: failed after all retriesdelivery_rate: sent / queued ratio
open_rate: unique opens / deliveredclick_rate: unique clicks / deliveredunique_recipients_sent: distinct contacts who received the send
top_failure_reasons: ranked list of failure causesfirst_sent_at/last_sent_at: useful for diagnosing batch timing issues

