Hi,
the link for the “pre-defined core set” on this page (Metrics) is wrong. It points to https://github.com/Graylog2/graylog2-server/blob/master/src/main/resources/prometheus-exporter.yml, the correct link is graylog2-server/prometheus-exporter.yml at master · Graylog2/graylog2-server · GitHub
Sascha
Edit: The link for “pre-defined metric mappings” on the same page points to the wrong link as well.