Add Grafana summary and detail dashboards

README.md

@@ -108,6 +108,33 @@ docker-compose up --build -d
 
 It expects a local `config.json` next to the compose file and exposes port `8080` for health and metrics.
 
+## Grafana
+
+A simple starter dashboard for the current Tasmota schema is included at `docs/grafana/tasmota-simple-dashboard.json`.
+
+Assumptions:
+
+- Grafana uses the built-in `InfluxDB` datasource plugin
+- the datasource is configured for InfluxDB v3 with query language set to `SQL`
+- the datasource points at the same database name configured in `MQTT_SCRUBBER_INFLUX_DATABASE`
+
+Import the dashboard JSON and bind the `DS_INFLUXDB` input to your InfluxDB datasource.
+
+The dashboard includes a `Device` variable for the selected-device section and a `Relay Device` variable that only lists devices publishing relay fields.
+
+Use `Device` for the health row, time series, and recent-state table. Use `Relay Device` for the relay status row so non-relay devices do not clutter that picker.
+
+The dashboard currently visualizes fields that are known to be emitted by the parser today and that exist with the default topic subscription set:
+
+- `tasmota_sensor`: `energy_power`, `energy_voltage`, `energy_total`, `analog_temperature`, `analog_a0`
+- `tasmota_state`: `wifi_signal`, `uptime_sec`
+
+If you also want LWT availability panels, add `tele/+/LWT` to the configured MQTT topics so the `tasmota_lwt` measurement is created.
+
+Relay panels use the latest `power`, `power1`, `power2`, `power3`, and `power4` values from `tasmota_state`. Devices that do not publish a given relay field will show no value for that panel.
+
+The dashboard is split into a fleet summary section and a selected-device section. The selected-device section also includes `Last Seen`, `Seconds Since Last Message`, and `Messages In Range` panels derived from both `tasmota_state` and `tasmota_sensor` timestamps.
+
 ## Notes
 
 - The repo name is kept as `mqqt-scrubber` to match the existing folder.