how to count kafka sink number

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URL: http://deprecated-apache-flink-user-mailing-list-archive.369.s1.nabble.com/how-to-count-kafka-sink-number-tp27829.html

hi 

i have a flink sql, reading record from kafka, then use table function do some transformation, then produce to kafka. 

i have found that in the flink web  record received of  the first subTask is always 0 ,and   the Records send of the last subTask is 0 as well.

i want to count how many records i consumed from the source kafka and how many records i produce to the target kafka,

how can i get these information from flink directly?

best regards

chong