Deleting and Restoring Nodes in the Alert Monitoring Tree

Use

Monitoring objects in the alert monitoring tree are created during the first run of the corresponding data suppliers and stored in the monitoring segment of the shared memory. At the start of the alert monitor, the information is read from the shared memory and displayed in various monitors broken down by components and applications and grouped by topic.

You can remove individual nodes or entire subtrees both from the display and from monitoring by the monitoring architecture. This can be useful to improve the clarity of the monitors that you are using or to improve the performance of the monitoring. You must differentiate between four types when deleting:

Remove the node from the display
Stop the associated data collection methods
Delete the node in shared memory
Delete the class properties (such as threshold values) from the database

In addition to the commands described here, you can also Deactivate Monitoring Tree Elements. This means that no more values are collected for the nodes. However, the nodes remain in the alert monitoring tree with the entry <<<<Node is deactivated>>>> and are not deleted from the shared memory.

Prerequisites

To delete a node, you must first activate the maintenance functions.

Deleting a Node from the Alert Monitoring Tree

Start the Alert Monitor. To do this, choose CCMS → Control/Monitoring → Alert Monitor, or call transaction RZ20.
Activate the maintenance functions. To do this, choose Extras → Activate Maintenance Functions.
Start the monitor in which you want to delete a node and select the desired node.
Choose Edit → Nodes (MTE) → Delete. The system displays the Note for "Delete Node" Operation screen. You have the following options:

Remove the node from the display (Option 1)

With this option, you change only the display of the node in the alert monitoring tree. To allow you to do this, the system displays the definition of the monitor. Change the definition so that the relevant node is no longer part of the monitor. This is only possible for your own monitors, as you cannot change the monitors delivered by SAP (see Creating and Changing Monitors).

Delete the node from the runtime environment (Option 2)

With this option, you delete the node from the alert monitoring tree and from the shared memory. This option is not possible for virtual nodes.

We recommend that you use the deactivation of nodes instead of options 2 to 4. The advantage is that you can reactivate the deactivated nodes much more easily.

You should, in particular, not use options 3 and 4 in most cases, as even a node that you have deleted using option 2 neither creates workload due to monitoring nor requires space in the monitoring segment. It is therefore not necessary to additionally delete the class properties of the node in the database.

Restoring a Node in the Alert Monitoring Tree

If you want to restore a node that you have deleted, follow the appropriate procedure below, depending on the deletion method that you used:

You only deleted the node from the display (option 1)

In this case, you only need to change the corresponding monitor definition again.

You deleted the node in the runtime environment (options 2-4)

In general, nodes that have been deleted from the shared memory are recreated and provided with values again, at the latest when the relevant application server is restarted. For nodes with passive data suppliers (the data collection methods), it is sufficient to execute the corresponding method. Follow the procedure below:

Choose CCMS → Configuration → Alert Monitor, or call transaction RZ21.
In the Topology group box, choose Segment Overview and choose Display Overview.
The system displays the Monitoring: Display Technical Topology screen. Choose change mode with the Display « Change () pushbutton.
Choose the segment that contains the node. If the deleted node is contained in a subtree of an application server, this is the segment with the name of the application server; otherwise, the segment is the central instance.
Choose Reset Segment in "WARMUP" Status. This restarts all startup methods of this monitoring segment.

You can find out whether a node is provided with data by passive or active data suppliers by choosing the Properties for the node. If an entry exists for Data Collection Method in the tab page Methods, the node is supplied with data by a passive data supplier.