Notes about Metric Data Retention

15-10 Configuring and Using the Diagnostics Framework for Oracle WebLogic Server 5. As polled data values for a metric arrive in the Monitoring Dashboard, the new values are added to the chart. The oldest values obtained from the Archive, if available, are purged. The chart always displays the most current data. The maximum samples for a chart determines how many samples can be saved for metrics, in both current and custom time range charts. After a chart reaches its maximum samples threshold, the oldest metric values are removed as newest arrive.

15.4.3 Notes about Metric Data Retention

If you exit from the Monitoring Dashboard, either by closing the Monitoring Dashboard window or by logging out, the browser prompts you to confirm your choice because all metric values captured by the Monitoring Dashboard during the session will be lost. Exiting from the Monitoring Dashboard has no effect on collected metrics persisted in the Archive. However, note that the Archive may have a data retirement policy in effect that limits how long data is retained there. For more information, see Section 6.4, Retiring Data from the Archives.

15.5 The Parts of a Chart

A chart consists of the following: ■ Chart name ■ Chart viewport, which shows the data values of one or more metrics that are displayed according to the chart type. The type can be a time-series chart that plots individual data points over a specified time span, or a gauge that shows the current or most recent value of a metric along with statistics indicating maximum, minimum, average, and standard deviation values. ■ X- and Y-axes for plotting diagnostic data – For time-series charts, data point plots against a time-based X-axis. You can zoom in or out to see a larger or smaller time segment in the viewport. – The Y-axis has a range and, by default, the range is automatically set to include all the data points in the chart. – You can optionally configure minimum and maximum values for the Y-axis. ■ A legend for each metric that includes the name of the metric and the colored marker symbol that is used for that metric in the chart viewport. The metric legend includes a button that, when selected, provides access to operations that can be performed with the metric, such as: – Changing the name that is displayed for the metric in the chart, as well as the shape and color used for the metric data points displayed in the chart viewport – Copying or moving the metric to another chart, moving the legend within the current chart, or deleting the metric from the chart ■ Chart series overview The chart series overview, which is available for time-series charts, indicates the portion of metrics data currently visible in the chart in relation to the whole set of data that has been collected for the corresponding metrics for the represented period of time. You can drag-select in either the viewport or the chart series overview to zoom in or out of the chart’s data.