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Problem events in Zabbix can be acknowledged by users.
If a user gets notified about of a problem event, they can go to Zabbix frontend, navigate from events to the acknowledgment screen and acknowledge the problem. When acknowledging, they can enter their comment for it, saying that they are working on it or whatever else they may feel like saying about it.
This way, if another system user spots the same problem, they immediately see if it has been acknowledged and the comments so far.
This way the workflow of resolving problems with more than one system user can take place in a more coordinated way.
Acknowledgment status is also used when defining action operations. You can define, for example, that a notification is sent to a higher level manager only if an event is not acknowledged for some time.
The acknowledgment status of problems is displayed in Monitoring → Events.
The Ack column contains either a 'Yes' or a 'No', indicating an acknowledged or an unacknowledged problem respectively. A 'Yes' may also have a number with it in brackets, indicating the number of comments for the problem so far.
Both 'Yes' and 'No' are links. Clicking them will take you to the acknowledgment screen.
To acknowledge a problem, enter your comment and click on Acknowledge and return or simply Acknowledge. 'Acknowledge and return' will take you back to the event screen.
Any previous comments for the problem are displayed above the comment area.
Acknowledgment information is fully displayed in the event details screen accessible by clicking the time of event in Monitoring → Events.
Acknowledgment status is displayed in the Last 20 issues block of Monitoring → Dashboard.
Acknowledgment status is displayed in Monitoring → Triggers as well. Acknowledgment status is also used with the screen filtering options. You can filter out acknowledged or unacknowledged triggers.