On Thu, Nov 28, 2019 at 1:32 AM Lennart Poettering <lenn...@poettering.net> wrote: > > Ideally we wouldn't even come up with our own file format for these > ring buffers, and just use what is already established, but afaiu > there's no established standard for time series ring buffer files so > far, hence I figure we need to come up with our own. I mean, after all > the intention is not to process this data ourselves but have other > tools do that.
A classic and still widely used format for this is an RRD file as popularized by RRDtool. You can see some description at https://oss.oetiker.ch/rrdtool/tut/rrdtutorial.en.html and https://en.wikipedia.org/wiki/RRDtool. Another one we came across at Endless was a whisper database used by Graphite. It's a text format similar to RRD. See https://graphite.readthedocs.io/en/latest/whisper.html. A more recent and popular tool is prometheus. See https://prometheus.io/docs/prometheus/latest/storage/ for how it stores data on disk. It appears that the actual on disk format is documented at https://github.com/prometheus/prometheus/blob/master/tsdb/docs/format/README.md. Alternatively, you could potentially setup systemd as a prometheus exporter (https://prometheus.io/docs/instrumenting/exporters/) that prometheus pulls from. That obviously makes systemd metrics not as usable out of the box and more suited to server usage than desktop usage. _______________________________________________ systemd-devel mailing list systemd-devel@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/systemd-devel
