graph.py

        # Show tooltips on test data
        hover = HoverTool(
                tooltips=[
                    ('Test', '$name'),
                    ('Date', '@created_at_{%F}'),
                    ('Branch', '@branch_'),
                    ('Revision', '@revision_'),
                    (metric, '@$name{0.0}')],
                formatters={
                    'created_at_': 'datetime', # use 'datetime' formatter for 'date' field
                    },
                )

        p = figure(title=f'{gapp_name} historic results',
                y_axis_label=f'Mean {metric} ({heuristic} is better)',
                x_axis_label='Date',
                tools=['pan', 'wheel_zoom', 'box_zoom', hover, 'reset'],
                active_scroll='wheel_zoom',
                # plot_width=plot_width,
                plot_height=plot_height,
                x_axis_type='datetime')
      
        # Annotations
        annotation_renderers = []
        for class_name, model_annotations in annotation_mapping.items():
            for model_annotation in model_annotations:
                color = 'blue'
                alpha = 0.2
                span = Span(location=model_annotation.annotation.datetime, dimension='height', line_color=color, line_width=2,
                    line_alpha=alpha, level='glyph', visible=False)
                label = Label(x=model_annotation.annotation.datetime,
                        y=plot_height/3, y_units='screen', text=str(model_annotation), level='glyph', angle=pi/2,
                        text_alpha=0.75, visible=False)
                annotation_renderers.append(span)
                p.add_layout(span)
                p.add_layout(label)

        p.add_tools(HoverTool(
                renderers=annotation_renderers,
                tooltips=[
                    # How do I get annotation data to appear here?
                    ('hi', 'hi'),
                    ]
                ))