• Create a script in script library, e.g.:

instances = %{ }; // Create empty hash map

instances[".1.1.1"] = "name_one";
instances[".1.1.2"] = "name_two";

return instances;

• Create a DCI. In "General" tab in DCI properties there are two macros - {instance} and {instance-name}. E.g. ".1.1.1" from the script will go into {instance}, "name_one" into {instance-name}.

• In "Performance" tab in DCI properties the situation is opposite - {instance} will be filled with "name_one" (this is so for some historical reasons, should be changed in some future releases).

Now, when you do Poll->Instance discovery on a node (or wait when it would happen automatically), the script will be executed, values returned by this script will be used to create/update DCIs.

The script in the above example returns hash map. It could also return an array, in that case {instance} would be taken from that array. In instance discovery filter script it's possible to modify or add {instance} and {instance-name}.

return Instance(displayName: "name_one", name: ".1.2.3");

Now wee need to get the legend name. This could be done either from that script in script library or from instance discovery filter script:

transport = $node->createSNMPTransport();
if (transport != null) {
  legend_name = SNMPGetValue(transport, ".1.2.3.4.1");
}

There are some examples in NXSL docs: https://www.netxms.org/documentation/nxsl-latest/