Ensure you are on a dashboard (not created from a template).
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Click the menu located in the top-right corner of the screen.
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Select 'Add Visualization' -> 'Create new gadget.'

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In the 'Create new gadget' window, select 'Combo' as the gadget type.

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Enter a name for the Combo chart gadget.
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To display an existing metric, click 'Add Metric' and choose from the list of pre-defined metrics.
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Alternatively, you can create a new metric specifically for this gadget by clicking on 'Create Single-use Metric.'
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Choose a dimension for the X-axis. In the provided example, we use 'date.'
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To plot the trend or average for the selected metric, toggle on the 'Plot average' or 'Plot trend' setting on the metric

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Add a second metric to the gadget and set the type to 'line'.

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If the scales of the chosen metrics vary greatly, toggle on the 'Separate Y Axis' & 'Opposite' settings on the metric to bring it into view.

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Set the default date range for your Combo chart using the date picker
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If you want to set up a report to drill down to from this gadget, select a report from the dropdown located in the top-right corner.
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Once you've configured the default date scope, run time filters & scope filters, click 'Save'.
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The Combo chart gadget will be added to the bottom of your report. Scroll down if needed to re-position and resize the gadget as required.
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Create a bar chart

Create a time series chart

Create a stacked bar chart