For line chart widgets, the state of the computation of the associated metric for a particular date is directly available from the chart. When the metric is successfully computed, the Portal displays a solid line in the line chart.
When the computation of the metric is consistently successful for several days, the solid line joins the points that represent the value of the metric along the whole selected period. Hovering the mouse cursor over the chart displays, the value of the computation on the selected date:
If a metric defines threshold values, make them visible in the line chart by ticking the option Thresholds when configuring the widget. The lower threshold is depicted as a horizontal orange line and the higher threshold as a horizontal red line. Likewise, value points in the chart are highlighted in orange when they exceed the first threshold value or in red when they exceed the second threshold value:
However, the Portal is not always able to compute the metric of a widget on a particular date. When this happens, the chart of the widget replaces the solid blue line by a dashed line or by empty space to indicate that the computation could not be carried out. Hovering over a non computed area of a chart with the mouse displays a message that helps you identify the cause for the lack of data.
We list below the reasons why there might be a lack of data in the chart of a widget and we illustrate them with example figures from the Portal. We finally discuss the
First computation of the widget
Before the first computation of a widget, there is no data available for it. Therefore, the chart does not display any line before the first computation of the widget.
If you hover the mouse over the empty area, the chart displays the date, the name of the metric and the message no data computed:
A widget can miss some days of computation because the Portal or the Engine were stopped or because the connection between the Portal and the Engine was lost for some time.
If the computation was not run on one or more days, the chart displays a dashed straight red line between the two dates where there is actually some data. Additionally, when you hover the mouse over it, the chart displays the message no data computed.
The widget was not computed because there was not data available for it. The connection with the Engine is fine in this case, but the Engine just does not provide proper data for the widget.
This occurs with activity widgets and service widgets when the type of activity that they monitor did not take place over the requested period of time and providing a zero value does not make sense. For example, a widget that computes the average response time of an application will show no activity if the application was not executed over the specified period. Showing zero response time for the application is not a valid option in this case.
This situation can also happen with inventory and issue widgets that refer to objects grouped by a specific keyword. If you change the group by property of the widget and you do not recompute it for the past dates, the data for those dates will be lost showing no activity.
The chart displays a dashed blue line at the level of the axis and the message no activity when hovering with the mouse.
KPI, table, and bar char widgets represent the absence of computed metric data by a dash sign ( - ) in the place of the value.
One day only
Because of an undefined aggregation strategy, the computation of some metrics does not make sense for periods longer than one day. When selecting a period longer than one day in the Portal, the widgets related to these metrics show the following message:
If a widget has a configuration error, e.g. because the associated metric has been deleted, the Portal displays the following message in the middle of the dashboard area assigned to the widget: