# Data Coverage

> A dashboard item that charts the share of expected minutes received per period and group, marking weak periods and naming the sources behind them.

Source: https://proxus.io/docs/analyze/dashboard-items/data-coverage

The **Data Coverage**  item charts how much of the expected data
arrived, period by period, with one line per group (a plant or a gateway, for example). Use it to see when data went
missing and how much, next to the [Data Completeness](https://proxus.io/docs/analyze/dashboard-items/data-completeness) list.

- **Facts.** How many sources delivered in the latest period, how many periods are below the complete limit, and the
  weakest period of the window.
- **Chart.** The share of expected minutes received per period, with a dashed line at the complete limit. A period
  below it is marked with a red point.
- **Tooltip.** The share per group for the period you point at, and the sources that sent less than expected in it,
  with the minutes each one lacks.

The item reads the same rows as the completeness list and follows the dashboard's filters: select a source there and
the chart shows that source alone.

## Data fields

**Period**, **Source**, **Minutes received** and **Minutes expected** are required: one row per source and period,
as for [Data Completeness](https://proxus.io/docs/analyze/dashboard-items/data-completeness). **Group** draws one line per group;
without it the item draws one line for all sources.

## Settings

**Complete from (%)** places the dashed line and decides which periods are marked. Use the same value as on the
completeness list.

## Where to see it

The Meridian demo plant uses it on **Meridian · Data Feed Command Center**.

## Related

- [Data Completeness](https://proxus.io/docs/analyze/dashboard-items/data-completeness)
- [Data Gaps](https://proxus.io/docs/analyze/dashboard-items/data-gaps)
- [Proxus dashboard items](https://proxus.io/docs/analyze/dashboard-items)