Creating a counter out of log occurrences and scraping the log itself

Hi Community,
can you please advice me how to proceed with the following topic?

I am feeding unstructured logs from 3rd party application to the logstash via UDP feed. Logs are categorized by using grok script. For some log entries I don't want to keep the log itself (as the amount of the events is excessive and it is not practical to keep them) but instead I just want to create a per second or per minute counter for the occurrences of the log and store it in some variable.

I don't know how to make this counter and remove unnecessary logs.

Please help.

Best regards

Take a look at the metrics filter.

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