Alerts › open. Resolve is on the row, after ack. The hub also closes an alert on its own when the condition clears.
Open Alerts. Resolve is on the row, after ack. Accounts server has a disk warning the hub still considers open. Press resolve when you have already dealt with it. Ack only records that you saw it. There is no accept. This shot has not pressed resolve.
The box is titled resolve. The comment is optional. Leave it empty and resolve still closes the alert. A note you type stays on the thread after the row moves to resolved. This shot stops before that press, so the alert is still open. Cancel drops the box and leaves the row open.
Recording that you saw it, without closing it, is Acknowledge an alert on your machines. A note that leaves the state alone is Leave a comment on your alert. The list is See alerts on your machines. What your provider sees, including accept, is Resolve an alert by hand.