Alerting key value not showing in OpenSearch Monitor UI

Plugins Alerting
1

Versions (relevant - OpenSearch/Dashboard/Server OS/Browser):

opensearch/dashboard version : 2.18.0

Describe the issue:

Hi, I’m currently facing an issue with the Alerting feature in OpenSearch.

When I go to Alerting > Monitors > [Monitor Name], I can see alerts being triggered with a status of either active or completed, but the “key” value I configured doesn’t show up — it just displays a dash (-), like the key is missing.

For context:

  • I set the group by field to host.name when configuring the monitor.
  • In the alert index, I can see the key is correctly stored like this:
    key: {"host.name": "server1"}

So it seems like the key is being generated and stored, but not displayed in the monitor UI.

Has anyone experienced this or know what might be causing the key not to appear in the UI?

Thanks in advance for your help!

Configuration:

Monitordetails :
type :per bucket monitor
Group by : host.name

Relevant Logs or Screenshots: