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i need to trigger email when data storage is hitting the limit.i dont see any configuration where i can set the email based on some usage.Please suggest.Is there any way without using the third party(appexchange)tools.

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I don't think you can use trigger here. But you can use scheduler class and Limit API to get these details.

Essentially, you have to build an apex class which does a callout to the REST API. You can then schedule that class to run in scheduled Apex. The big problem is that you have to pass a username and password as part of the login call to get a session:

  1. How to login and get a session -
  2. Class to call the login:
public class CurrentStorage {

@Future(callout=true)
public static void getStorage() {

String sid = Login.login('', '');


HttpRequest req = new HttpRequest();

req.setMethod('GET');
req.setEndpoint('
https://na2.salesforce.com/services/data/v32.0/limits');
req.setHeader('Authorization', 'OAuth '+ sid);

Http http = new Http();

HTTPResponse res = http.send(req);

Map m = (Map)JSON.deserializeUntyped(res.getBody());
Map dataStorage = (Map)m.get('DataStorageMB');

System.debug('Current Storage: ' + dataStorage.get('Remaining'));
return;
}

}

Reference:

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