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docs/metrics.md so far explained just the REST API for retrieving current metrics from a single Scylla node. In this patch, I add basic explanations on how to use the Prometheus and Grafana tools included in the "scylla-grafana-monitoring" project. It is true that technically, what is being explained here doesn't come with the Scylla project and requires the separate scylla-grafana-monitoring to be installed as well. Nevertheless, most Scylla developers will need this knowledge eventually and suprisingly it appears it was never documented anywhere accessible to newbie developers, and I think metrics.md is the right place to introduce it. In fact, I myself wasn't aware until today that Prometheus actually had its own Web UI on port 9090, and that it is probably more useful for developers than Grafana is. Signed-off-by: Nadav Har'El <nyh@scylladb.com> Reviewed-by: Botond Denes <bdenes@scylladb.com> Message-Id: <20190129114214.17786-1-nyh@scylladb.com>