Histogram panel
This documentation topic is designed for Grafana workspaces that support Grafana version 8.x.
For Grafana workspaces that support Grafana version 10.x, see Working in Grafana version 10.
For Grafana workspaces that support Grafana version 9.x, see Working in Grafana version 9.
The histogram visualization calculates the distribution of values and presents them as a bar chart. The Y-axis and the height of each bar represent the count of values that fall into each bracket while the X-axis represents the value range.
Histogram visualization supports time series and any table results with one or more numerical fields.
Display options
Use these options to refine your visualizations:
Bucket size
The size of the buckets. Leave this empty for automatic bucket sizing (~10% of the full range).
Bucket offset
If the first bucket should not start at zero. A non-zero offset shifts the aggregation window. For example, 5-sized buckets that are 0–5, 5–10, 10–15 with a default 0 offset would become 2–7, 7–12, 12–17 with an offset of 2; offsets of 0, 5, or 10, in this case, would effectively do nothing. Typically, this option would be used with an explicitly defined bucket size rather than automatic. For this setting to affect, the offset amount should be greater than 0 and less than the bucket size; values outside this range will have the same effect as values within this range.
Combine series
This will merge all series and fields into a combined histogram.
Line width controls line width of the bars.
Fill opacity controls the fill opacity of the bars.
Gradient mode sets the mode of the gradient fill. Fill gradient is based on the line color. To change the color, use the standard color scheme field option. Gradient appearance is influenced by the Fill opacity setting.
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None – No gradient fill, this is the default setting.
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Opacity – Transparency of the gradient is calculated based o n the values on the Y-axis. Opacity of the fill is increasing with the values on the Y-axis.
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Hue – Gradient color is generated based on the hue of the line color.
Tooltip mode When you hover your cursor over the graph, Grafana can display tooltips. Choose how tooltips behave:
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Single – The hover tooltip shows only the series that you are hovering over.
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All – The hover tooltip shows all the series in the visualization. Grafana highlights the series that you are hovering over in bold in the series list in the tooltip.
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Hidden – Do not display the tooltip.
Note
Use an override to hide individual series from the tooltip.
Legend options
When the legend option is enabled, it can show either the value mappings or the threshold brackets. To show the value mappings in the legend, it’s important that the Color scheme option under standard options is set to Single color or Classic palette. To see the threshold brackets in the legend, set the Color scheme to From thresholds.
Legend mode Use these settings to refine how the legend appears in your visualization.
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List – Displays the legend as a list. This is a default display mode of the legend.
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Table – Displays the legend as a table.
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Hidden – Hides the legend.
Legend placement Choose where to place the legend.
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Bottom – Below the graph.
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Right – To the right of the graph.
Legend calculations
Choose which calculations to show in the legend. For more information, see Calculations list.
