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what's the meaning of latency indicator reported by flink metrics through prometheus?


Hi there,

I have integrated kafka with flink1.5, also with the help of prometheus and
Granada to display metrics of flink 1.5,
now i get three indicator about latency as below:
1)flink_taskmanager_job_latency_source_id_source_subtask_index_operator_id_operator_subtask_index_latency(short
for latency)
2)flink_taskmanager_job_latency_source_id_source_subtask_index_operator_id_operator_subtask_index_latency_count(short
for latency_count)
3)flink_taskmanager_job_latency_source_id_source_subtask_index_operator_id_operator_subtask_index_latency_sum(short
for latency_sum)

it seems 1) to be the latency value of one real subtask, 
for 2),latency_count always equal to one const, in my example the value is
128,
for 3),latency_sum always equal to zero.

could you tell me what's the meaning of 2) and 3)?

Best regards & Thanks.
Rui, Wang

<http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/file/t1661/latency_metric.png> 



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