Missing metrics documentation

Elastic Stack Beats
1

I am trying to evaluate performance of filebeat instalation in a K8S, for that I was able to export filebeat metrics to prometheus.
I was unable to find any comprehensive documentation regarding the metrics, so I am not sure which one are counters or gauges, nor I know the real meaning of all metrics. I checked this documentation, but there are missing metrics and it seems that some metrics have troubleshoot hints that are wrong. There is no information on which is counter or gauge.

Is there anywhere that will have explanation for each metric and metric type as well (counter or gauge)?

Thanks in advance

2

For those who will end up in this post searching for the same thing, I was able to more or less compile a list of the metrics and the meaning of some of them. Some I got from elastic site and others directly from beat or filebeat code.
Feel free to open issues in the repository if you think something is wrong or if you know some of the metrics that are not explained.
Also, I have converted all metrics to prometheus style metrics, so each “.” was converted to “_”, and some fields that were not numeric were converted in a special kind of metric with info in the end where the label value will represent the string the the metric will be a gauge with value 1.