Steps to reproduce:

1. Install Zabbix server/frontend/agent.
2. Create logfile.

   1. echo OK >> /tmp/actions.log

1. Create log monitoring item to "Zabbix server" host.

   1. log[/tmp/actions.log]

1. Create "ACTION TEST" trigger to "Zabbix server" host.
   1. Name: ACTION TEST
   2. Expression: find(/Zabbix server/log[/tmp/actions.log],,,"NG")=1
   3. PROBLEM event generation mode: Multiple
2. Create trigger action.
   1. Conditions: Trigger name contains ACTION TEST
   2. Operations: Send message to users: Admin (Zabbix Administrator) via Email
   3. Recovery operations: Send message to users: Admin (Zabbix Administrator) via Email
3. Config Admin user to Email media.
4. Create test script on Zabbix server host to generate many problems.

   1. #!/bin/bashfor i in {1..1000}; do
        echo NG >> /tmp/actions.log
      done 

1.  Run the script.

   1. sh test.sh

1. Resolve the problems.

   1. echo OK >> /tmp/actions.log

Result:

In "Problems" page, number of actions is 99+ in each problem. See result.png.
Expected:
Each problem show just two actions that operations and recovery operations.