What is the maximum number of attributes that can be used in a map? It should be noted that we can not not use too many attributes. Depending on the available memory, how to estimate the number of attributes that can be used?

the attributes are metadata attached to a message for an Integrator Server point of view.
there is no official limit but if too much are used it can involve a freeze of the Integrator Server cause too much memory is used.
if the customer wants to use more than 5000 attributes(simple attributes key value, for the complex attributes this limit should be divided by the number of fields of the complex attribute), we suggest to use a more adapted solution like a database.
the attributes are stored in memory even if the messages are handled by the filer task and stored in flat files, so that it can cost a lot of memory and especially fragment the memory cause the attributes are allocated one by one