qrcode.net example c# Configuring the counters to monitor before specifying how the alerts are handled in .NET

Making QR Code in .NET Configuring the counters to monitor before specifying how the alerts are handled

Configuring the counters to monitor before specifying how the alerts are handled
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The following list describes some of the parameters you can configure on the General tab:
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Comment Even though the alert has a name, you can also supply a comment to help you or others recall what the purpose of the alert is and to whom the alert goes. Alert When The Value Is You can specify whether to trigger if the alert is under the Limit value or over the Limit value. Limit You can specify the value of the counter to be monitored. When the value goes over or under this limit (based on the selection in Alert When The Value Is), the alert is triggered.
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Lesson 1
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Monitoring Network Performance 12-11
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Interval You can set how often the Performance console queries the system for what you want to monitor. The system doesn t continuously monitor for the counters you want; rather, it performs samples over a certain amount of time. The longer the interval, the less accurate the sample is because it is being sampled less. The shorter the interval, the more accurate the sample is, but the more the proces sor is used when getting the sample. Units You can specify the units in time to collect samples. For instance, you might not want to sample every 5 seconds; instead, you might want to sample every 30 seconds. Again, if you reduce the frequency of sampling, you ll use fewer processor cycles, but you will be less accurate. Run As You can sample the counters by selecting either the System account or another account of your choice. Occasionally, counters can be user-specific, which is necessary. However, for monitoring network-related counters, the System account has access to what it needs to perform the work.
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If two or more counters are being monitored, you must select each counter and set the Alert When The Value Is, Limit, Interval, and Units fields. The Comment field and Run As field will be used for all counters in an alert.
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After you set these parameters, you select the Action tab, as shown in Figure 12-8.
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Figure 12-8
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Using the Action tab to specify how you want to handle the notification of your trigger
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12-12
12
Maintaining a Network Infrastructure
The Action tab specifies what happens once an alert is triggered. A multitude of options let you know that your counter s criteria have been met. The various options are as follows:
Log An Entry In The Application Event Log Selecting this option puts an event in the event log, which you can see using Event Viewer. A notice of the counter, value, and limit are part of the log entry, as shown in Figure 12-9.
Figure 12-9
Example event based on triggers
Send A Network Message To Selecting this option sends the equivalent of a Net Send command with the alert s message. You need to specify the name of a computer here, not a user. For messages to be sent out, the Alerter service must be started on the machine from which you are doing the monitoring. For messages to be received, the Messenger service must be started on the receiving computer. Neither of these services runs on a newly installed Windows Server 2003 server; you must manually change the state from Disabled to Automatic and ensure that the services are running. Start Performance Data Log You can configure the alert system to start by writing additional counters to a log file to be reviewed later. You need to preset the log file by using the Counter Logs node within the Performance Logs And Alerts node, as seen earlier in Figure 12-6.
Lesson 1
Monitoring Network Performance 12-13
Run This Program Once your trigger has gone off, you can execute an external program. You might have an external paging network or some other external alert system to help you find out when triggers go off. Or, in the most extreme case, you might choose to shut down the system when an alert is triggered. You would perform this task by running the built-in Shutdown.exe command found in Windows Server 2003.
Finally, you can configure the settings on the Schedule tab, which help you determine when to trigger. For instance, you might not want to get alerts at off-peak times or on weekends. Or maybe you do! It s your choice. If you do not choose to run the alert within a schedule through the Schedule tab, you must manually start your alert. To do so, right-click the alert you just created and select Start, as shown in Figure 12-10.
Figure 12-10
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