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Using the Synapse Grafana dashboard

Set up Prometheus and Grafana. Out of scope for this readme. Useful documentation about using Grafana with Prometheus: http://docs.grafana.org/features/datasources/prometheus/
Have your Prometheus scrape your Synapse. https://matrix-org.github.io/synapse/latest/metrics-howto.html
Import dashboard into Grafana. Download synapse.json. Import it to Grafana and select the correct Prometheus datasource. http://docs.grafana.org/reference/export_import/
Set up required recording rules. contrib/prometheus