i have 2 filed is number is upbyte  and downbyte , and i want to add 1 filed is bandwith (sum of there) in logstash, how can i do this?
             
            
               
               
               
            
            
           
          
            
              
                eperry  
                (Ed)
               
              
                  
                    January 7, 2017,  6:17am
                   
                   
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              Try the aggregation filter
Or you can always use the ruby filter if all fails
Sort of an example
  
  
    Hi, 
I'm trying to demonstrate the feasability of switching from a Splunk solution to an ELK (Elasticsearch, Logstash and Kibana) stack (with Redis) solution for log analysis and triggering alerts. 
I have a requirement (due to a legacy application on a system with performace issues which is not the ELK stack server) to add a field at the time of indexing to events that shows the difference between two timestamps from the the same event (so I can't use the logstash elapsed filter plugin as that …
   
 
             
            
               
               
              1 Like 
            
            
           
          
            
              
                system  
                (system)
                  Closed 
               
              
                  
                    February 4, 2017,  6:17am
                   
                   
              3 
               
             
            
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