Docs: Add stat panel (#24459)

* Create stat-panel.md

* Update stat-panel.md

docs/sources/panels/visualizations/stat-panel.md

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+title = "Stat panel"
+description = "Stat panel documentation"
+keywords = ["grafana", "docs", "stat panel"]
+type = "docs"
+aliases =["/docs/grafana/latest/features/panels/stat/"]
+weight = 200
+draft = "true"
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+
+# Stat panel
+
+The Stat panel shows a one large stat value with an optional graph sparkline. You can control the background or value color using thresholds.
+
+{{< docs-imagebox img="/img/docs/v66/stat_panel_dark3.png" max-width="1025px" caption="Stat panel" >}}
+
+## Data and field options
+Stat visualizations allow you to apply:
+- Data transformations
+- Field settings
+- Field overrides
+- [Thresholds]({{< relref "../thresholds.md">}})
+- Value mappings
+
+## Automatic layout adjustment
+
+The panel automatically adjusts the layout depending on available width and height in the dashboard. It automatically hides the graph (sparkline) if the panel becomes too small.
+
+## 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.
+- **Color mode**
+  - **Value -** Colors only the value and graph area.
+  - **Background -** Colors the background as well.
+- **Graph mode**
+  - **None -** Hides the graph and only shows the value.
+  - **Area -** Shows the area graph below the value. This requires that your query returns a time column.
+- **Alignment mode -** Choose an alignment mode.
+  - **Auto -** If only a single value is shown (no repeat), then the value is centered. If multiple series or rows are shown, then the value is left-aligned.
+  - **Center -** Stat value is centered.