How could I pass a value of metric to a script in QUERYDESCRIPTOR?

It is possible to use the current or previous value of a metric as a argument to be passed to a script in QUERYDESCRIPTOR? As I am developing a MYSQL plug-in, and in my metadata xml file, I want to use the value of a metric I already defined as a argument to be pass to a script. But I don't know how to achive it in XML file.
For example,
At the begining of the metadata XML file, I defined a metric named m1. Then I want to defined another metric named m2 with a fetchlet. I want to pass the value of m1 to the script which will retrurn the value of m2.
Could you please tell me how to achive that in a xml file?
Thanks,
Satine

Hello Satine,
For this requirement, I used dynamic properties (use tag "DynamicProperties") as a solution.
From extensibility guide, as example is:
<DynamicProperties NAME="ClusterConfig" FORMAT="ROW"PROP_LIST="IsClusterEnabled">
<QueryDescriptor FETCHLET_ID="Snmp">
<Property NAME="NAME" SCOPE="INSTANCE">NAME</Property>
<Property NAME="hostname" SCOPE="INSTANCE">AgentHost</Property>
<Property NAME="COMMUNITY" SCOPE="INSTANCE" OPTIONAL="TRUE">CommunityString</Property>
<Property NAME="TIMEOUT" SCOPE="INSTANCE" OPTIONAL="TRUE">Timeout</Property>
<Property NAME="TABLE" SCOPE="GLOBAL">FALSE</Property>
<Property NAME="OIDS" SCOPE="GLOBAL">1.3.6.1.4.1.789.1.2.3.1.0</Property>
</QueryDescriptor>
</DynamicProperties>
Note: you can use ExecutionDescriptor also, instead of QueryDescriptor for DynamicProperties.
Now, you will use 'IsClusterEnabled' as any other instance property
e.g., in your metric query-descriptor, you can declare
<Property NAME="cluster" SCOPE="INSTANCE">IsClusterEnabled</Property>
Now that you know how to define dynamic-properties and use them across metrics, here is a warning. Dynamic Property computation will be done by OEM Agent when it starts. So, you may not like to define too many dynamic-properties, because then it will take more time for agent to start-up fully.
Regards,
-Shant

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