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05f8ed270b
Today I realised that although we have per-table metrics, they are not *really* available by default. I was suprised to find that we don't have (as far as I can tell) a document explaining why it is so, or how to enable them anyway. Moreover, the more I investigated this issue, the more I realised how little I know on Scylla's metrics - how they are calculated, how they are collected, their different types, and so on. So I sat down to figure out everything I wanted to learn about Scylla metrics, and then wrote it all down in a new document, docs/metrics.md. There are some missing pieces in this document marked by TODO, and probably additional missing pieces that I'm not aware of, but I think this is already a good start and can be (and should be) improved-on later. We really need to have more of these documents describing various Scylla subsystems to new developers - what each subsystem does, why it does what it does, where is the code, and so on. I am facing these problems every day as a seasoned developer - I can't even imagine what our new developers face when trying to understand a subsystem they are not yet familiar with. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Message-Id: <20180920131103.20590-1-nyh@scylladb.com>