You're using "Suppress Multiple Alerts of This Rule" and expect only 1 alert will be generated as long as it is not confirmed.
However, 2 or more alerts are generated for the same alert rule when messages failed within a very short time(less than 1 second).
SAP Netweaver XI/PI
Duplicate alerts, suppress , KBA , BC-XI-IS-WKB , Runtime Workbench / Monitoring , BC-NWA-XPI , Process Integration Monitoring , Problem
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