Hi there, I witnessed an interesting behaviour on my Grafana dashboard where sink related metrics would show activity where there should not be any. I am saying this because for this particular sink activity is triggered by data being ingested through a cronjob at a particular time, however the dashboard is saying there is activity also outside this time. I had a closer look and in my graph I am using the NonNegativeDerivative function (the data actually sits in Graphite) on the metric. Disabling this filter shows that for a short period of time the numRecordsIn counter is dropping and then gets back to the previous value. This drop is then shown on the graph and is looking like data activity because of the NonNegativeDerivative function. Why would the value of a counter temporarily decrease and then go back to its previous level ? Please see screenshots attached.
Thanks Philipp <http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/file/t576/Sink_numRecordsIn_NonNegativeDerivative_.png> <http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/file/t576/Sink_numRecordsIn_Value_Drops.png> -- Sent from: http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/
