- Every several seconds, Prometheus scrapes our `TANGO-Grafana Exporter <https://git.astron.nl/lofar2.0/ska-tango-grafana-exporter>`_ (our fork of https://gitlab.com/ska-telescope/TANGO-grafana.git), collecting all values of all the device attributes (except the large ones, for performance reasons).
- Prometheus can be queried directly on http://localhost:9090,
- The query language is `PromQL <https://prometheus.io/docs/prometheus/latest/querying/basics/>`, which is also used in Grafana to query Prometheus,
- The TANGO-Grafana Exporter can be queried directly on http://localhost:8000,
- The query language is `PromQL <https://prometheus.io/docs/prometheus/latest/querying/basics/>`_, which is also used in Grafana to query Prometheus,
Prometheus stores attributes in the following format::