Database Reference
In-Depth Information
Figure 3-5.
List of plug-ins installed for an agent
Monitoring region
: This shows details of the targets being monitored by this agent, metric
issues for these targets, and the top collections for them.
Performance and Usage region
: This details how well the agent itself has been performing,
as shown in Figure
3-6
. You should be aware of several important items in this region:
•
At first glance, the graphs can be confusing because the y axis seems to have no units of
measurement. In fact, the units are there, just in the caption for each graph.
•
The y axis is scaled, based on the results. That means that performance can look worse
than it really is. For example, the upload rate in Figure
3-6
looks bad at first glance, but it
reaches a maximum of just over 0.5 KB/sec, which is clearly not a problem!
•
Sometimes you need to look at two graphs to see an issue. Using that same upload rate
graph, performance is an issue only when the upload backlog (the graph to the right of
the upload rate) is increasing while the upload rate isn't increasing.
•
By looking at the Collection Performance graph, you can determine when an agent
is reaching the maximum number of targets it can monitor. As you can see in the tip
underneath the agent, when the value on the y axis approaches 100, the agent is reaching
capacity. This is probably not something you'll see often. (The agent in this case was
monitoring 114 targets, yet the percentage of the collection interval spent in execution is
averaging slightly under 0.02, which is a long way off 100!)
