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Locations in the map by default are labeled with the ID or the name of the location (configured in locations.xml or locationSets.xml). In LocationSets.xml (for EsriShapeFile or CSVFile) it is also possible to replace or add text to the label, such as location attributes (using @ATTRIBUTE_ID@, Since 2013.02 or csv/dbf columns without defining an attribute with %COLUMN_NAME%), or timeseries related information (%LAST_VALUE%, %LAST_VALUE_TIME%,%FORECAST_START_TIME%, %MAXIMUM_VALUE%, %MAXIMUM_VALUE_TIME%, %MINIMUM_VALUE%, %MINIMUM_VALUE_TIME%). In case of timeseries related information, the label only shows the information for the selected parameter.
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