[jira] [Created] (AMBARI-15749) Add AMS post processing function to show the metrics 'diff' over time.

["Aravindan Vijayan (JIRA)" <ji...@apache.org>]

Aravindan Vijayan created AMBARI-15749:
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             Summary: Add AMS post processing function to show the metrics 'diff' over time.
                 Key: AMBARI-15749
                 URL: https://issues.apache.org/jira/browse/AMBARI-15749
             Project: Ambari
          Issue Type: Task
    Affects Versions: 2.2.2
            Reporter: Aravindan Vijayan
            Assignee: Aravindan Vijayan
            Priority: Critical
             Fix For: 2.4.0


The use case is that, e.g. user wants to know how frequently the containers are allocated over time.  Currently, the num of allocated containers is an aggregated value, so it's always a monotonically increasing line chart.
To show how frequently the containers are allocated, currently we do have a 'rate' option on the UI. But the way that is calculated is ( NumContainers@T2 -  NumContainers@T1) / (T2 - T1)(in seconds). This results in decimal values on the UI.
Here, the use case is to just show the num 'diff' here, instead of dividing it by time interval.

With this change, I can change the Grafana UI to use bar chart.
Each bar represents the number of containers allocated between the the time interval (time interval here is the width of the bar)




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