[SPARK-26357][Core] Expose executors' procfs metrics to Metrics system#23306

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rezasafi wants to merge 7 commits intoapache:masterfrom

rezasafi:procfsexpose

Commits on Dec 13, 2018

Exposing Procfsmetrics to metric system
Reza Safi
committed

Commits on Dec 15, 2018

Fix the style issues and add a cache for metrics
Reza Safi
committed

Commits on Dec 17, 2018

Merge branch 'master' of https://github.com/apache/spark into procfsexpose
Reza Safi
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Fix the forgotten cache statement
Reza Safi
committed

Commits on Dec 18, 2018

Some style comments and some other review comments applied
Reza Safi
committed

Commits on Dec 19, 2018

Removing timestamp from case class per reviewers request and adding a synchronized block
Reza Safi
committed

Commits on Jan 25, 2019

Review comments addressed
Reza Safi
committed