Docs: Create bar-gauge-panel.md (#24458)

docs/sources/panels/visualizations/bar-gauge-panel.md

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+title = "Bar gauge panel"
+description = "Bar gauge panel docs"
+keywords = ["grafana", "bar", "bar gauge"]
+type = "docs"
+aliases =["/docs/grafana/latest/features/panels/bar_gauge/"]
+weight = 400
+draft = "true"
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+
+# Bar gauge panel
+
+The bar gauge simplifies your data by reducing every field to a single value. You choose how Grafana calculates the reduction.
+
+This panel can show one or more bar gauges depending on how many series, rows, or columns your query returns.
+
+{{< docs-imagebox img="/img/docs/v66/bar_gauge_cover.png" max-width="1025px" caption="Stat panel" >}}
+
+## Data and field options
+
+Bar gauge visualizations allow you to apply:
+- Data transformations
+- Field settings
+- Field overrides
+- [Thresholds]({{< relref "../thresholds.md" >}})
+- Value mappings
+
+## Display options
+
+Use the following options to refine your visualization:
+
+- **Show -** Choose how Grafana displays your data.
+  - **Calculate -** Show a calculated value based on all rows.
+  - **All values -** Show a separate stat for every row. If you select this option, then you can also select a **Limit**, or the maximum number of rows to display.
+- **Value -** Select a reducer function that Grafana will use to reduce many fields to a single value. Click the **Value** list to see functions and brief descriptions.
+- **Orientation -** Choose a stacking direction.
+  - **Auto -** Grafana selects what it thinks is the best orientation.
+  - **Horizontal -** Bars stretch horizontally, left to right.
+  - **Vertical -** Bars stretch vertically, top to bottom.
+- **Display mode -** Choose a display mode.
+  - **Gradient -** Threshold levels define a gradient.
+  - **Retro LCD -** The gauge is split into small cells that are lit or unlit.
+  - **Basic -** Single color based on the matching threshold.
+- **Show unfilled area -** Select this if you want to render the unfilled region of the bars as dark gray. Not applicable to Retro LCD display mode.