tree d5e0bd4e0231926041a0c71b0bfa404aa0070156
parent 92b21364c7234c57b4c4dcfa550078a2e2b82ada
author dhruv <dhruv@apache.org> 1479863361 -0800
committer Mariia Mykhailova <mariia@apache.org> 1482193571 -0800

[REEF-1675] Provide implementations of metrics utilities

This addressed the issue by
  * slightly modifying metrics interfaces.
  * providing the implementation of IMetricsCollector,
    IMetricsRecordBuilder, IMetricsRecord and IMetricsFilter.
  * providing tests for the implementations.

JIRA:
  [REEF-1675](https://issues.apache.org/jira/browse/REEF-1675)

Pull request:
  This closes #1188