Alert based on values of json log

I am logging Host metrics by regularly sending metrics values to Graylog in the following format:
{"CPU": 12.5, "RAM":56.3, "DISK":1.25}
How can I set an alert based on the value of CPU, RAM, DISK, or a combination of values? for example, if RAM is greater than 60 ?

Hello && welcome @EmbeddedAndMore

If you dealing with metrics you can get them from Graylog API using Prometheus /w Grafana.

By chance if MetricBeat is sending logs to Graylog Beat INPUT you can use those fields that are created to create some type of alert.

Our company does not use Graylog to trend metric data on Servers, we either use Grafana or Zabbix which is preferred at this time

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