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MBean attributes represent the current state of data and information within a managed object. The Attributes subtab contains a table with all attributes for the selected MBean. This table contains the following columns by default:
Name: The name of the attribute. If the name is displayed in bold, the value of the attribute can be changed. If the name is displayed against a grey background, the attribute is synthetic. Synthetic attributes are injected on the client side and do not actually exist in the server MBeans. If the attribute name is missing, this field will display as [N/A]
. In such cases, hovering your mouse will present a Tooltip with more information about the detected errors.
Value: The value of the attribute. If the value is not available, this field contains [N/A]
. If a reference value is set to null
, this field contains the value type surrounded by angled brackets (< >
). To change the value of a writable attribute, select it and provide the necessary value. If the value is boolean, clicking it will toggle between true
and false
.
Update Interval: This is the time interval at which the attribute is updated when subscribed to, for example when visualized in a graph or subscribed to for persistence. To change the interval, select it and enter the desired time. As you begin typing, a pulldown menu will appear, prompting you to choose an appropriate duration unit. Zero will force the attribute to update only once, when it is first fetched. If you provide an empty field, the time interval will be set to the default for this attribute. You can also change the update interval by right-clicking the attribute and selecting Change Update Interval in the context menu.
To add other columns, right-click anywhere in the table, and select Visible Columns. You can hide the default columns or add any of the following additional columns:
Type: The attribute value type. If the attribute type is missing, this field will display as [N/A]
. In such cases, hovering your mouse will present a Tooltip with more information about the detected errors.
Display Name: The name that is displayed when the attribute is added to a table, dial, or graph. To change the display name of an attribute, right-click its row and select Edit Display Name in the context menu.
Description: A short description of the attribute.
To add a numeric attribute to a graph on the Overview tab:
Right-click the attribute and select Visualize.
Select one of the available graphs or click Add Chart to add a new one, and click OK.
To refresh the value for an attribute, right-click the attribute and select Refresh.
For some attributes, you can select the content type to be used in graphs and tables. Right-click the attribute and select the necessary content type and units under the Interpret The Raw Value 1 As item in the context menu. If you change the content type of an attribute that is already used in a graph, it will be disabled for that graph, because a graph can only display attributes with the same content types. Also, any rules that use that attributes will be disabled.