Geneos does not have a such a report as standard, but (assuming you have enabled database logging) the events are logged to the database. It is therefore possible to write a SQL statement to retrieve this information, and push it towards any tool that can receive the SQL output (Excel for example). More details on how to do this are listed below.
Note this is not the same as taking the figures from the gateway-severity plugin as that only shows current totals and would not differentiate from alerts that day and those not cleared from previous days, these figures are not logged to database either.
The SQL statement below can be run on the event table in the Geneos database (replacing the contents between the angle brackets for your own requirements.
If you have multiple gateways that log to different databases, then you can use a script on the command line to aggregate the results, something of the nature: