[#BloombergLP-balm-MetricDescription-UserDataKey]
= xref:BloombergLP.adoc[BloombergLP]::xref:BloombergLP/balm.adoc[balm]::xref:BloombergLP/balm/MetricDescription.adoc[MetricDescription]::UserDataKey
:relfileprefix: ../../../
:mrdocs:

A key used to refer to a data value associated with a metric. Note that a `UserDataKey` can be used by clients of `balm` to associate additional information with a metric. See `balm_metricregistry` for information on obtaining a unique key.

== Synopsis

Declared in `<balm_metricdescription.h>`

[source,cpp,subs="verbatim,replacements,macros,-callouts"]
----
typedef int UserDataKey;
----


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