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7. Resource Traits
One category of information that is collected about a resource is its traits. Traits are descriptive information, usually information that does not change very frequently.
For example, traits for a platform include its operating system name and version, its distribution, its architecture, and its hostname. Most resources have similar identifying information, such as a version number or vendor information.
Traits are in-between information. They are detectable and are detected by the JBoss ON agent's monitoring processes. But they are also generalized descriptive information. Trait information is even shown on the resource's details page.
Figure 16. Resource Details
The traits that are collected are defined in the resource plug-in itself, so this information is viewable but not configurable through the UI. The list of traits for each resource type is covered in the Resource Reference: Monitoring, Operation, and Configuration Options.
7.1. Collection Interval
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By default for most resource types, traits are checked every 24 hours. Because traits change infrequently, they do not need to be collected very often.
The trait collection interval is configured the same as metrics collection intervals. To change the collection interval for a trait, see Section 4.5, “Setting Collection Intervals for a Specific Resource”.
7.2. Viewing Traits
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The Traits subtab in the Monitoring tab for a resource displays three pieces of information:
- The trait name. The traits which are monitored for a resource are defined with other monitoring settings in the resource type's plug-in descriptor.
- The trait value.
- The time of the last collection where a change in trait information was detected.
Figure 17. Trait Charts
7.3. Extended Example: Alerting and Traits
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The Setup
Trait information tends to be static. While traits can, and do, change, they do so infrequently. Also, traits convey descriptive information about a resource, not state data or dynamic measurements, so traits are not critical for IT administrators to track closely.
However, trait information can be valuable in letting administrators know when some configuration or package on the resource has changed because one trait that most resources collect is version information. If a version number changes, then some update has occurred on the underlying resource.
What to Do
For example, Tim the IT Guy has automatic updates configured for his Red Hat Enterprise Linux development and QA servers. Because his production environment has controlled application and system updates, there are no automatic updates for those servers.
Tim wants to be informed of version changes, but they are not necessarily a big deal. JBoss ON can issue an alert when a trait changes, with the Trait Value Change condition. (Cf. Section 11.2, “Basic Procedure for Setting Alerts for a Resource”.)
Figure 18. Trait Alert Condition
The alert for the development and QA systems is simple:
- He sets two conditions, using an OR operator. The alert triggers when the distribution version changes or when the operating system version changes. This catches both minor and major updates to the operating system or kernel.
- It is set to low priority so it is informative but not critical.
- Tim decides that the alert notification is sent to his JBoss ON user, so he sees notifications when he logs in. He could also configure an email notification for high-priority resources.
For Tim's production resources, he sets the alert priority to high and uses an email notification to multiple IT administrators so that they are quickly aware of any change to the production systems.
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