The GetModulesByTag action return all the modules and their itemId
that contain the tag parsed as parameter.

The returned value is a json format data like:
metadata => All the field definition.
data     => All the modules and their id.
numRows  => Number of results.

An example is:

Module/Tag/jsonGetModulesByTag/tag/this

/*
{"metadata":[
{"key":"module","label":"Module"}],
"data":[
{"id":"1","module":"Project"},
{"id":"2","module":"Project"},
{"id":"1","module":"Todo"}],
"numRows":3}
*/

If the parameter "limit" is set,
the array will contain only "limit" number of items

An example is:
Module/Tag/jsonGetModulesByTag/tag/this/limit/2

/*
{"metadata":[
{"key":"module","label":"Module"}],
"data":[
{"id":"1","module":"Project"},
{"id":"2","module":"Project"}],
"numRows":2}
*/