wip: docs metrics start
metrics documentation changes, changed history endpoint to runs, gauge example, querying by run-id
update to docs based on code review comments
code review comments
change based on review comments
fixed deleting metrics upon redeployment of changed app
Small doc changes
PR comment
use incrmenet and gauge in mr metrics
add json serializer to not send endTime if status is Running for programs
CDAP-808: Updated docs for cdap-examples apps regarding to services instead of procedures.
use gauge metrics in WordCount App Example
code review comments
doc fix
delete all datasets to delete only user datasets
Fix cdap-cli help message
Merge pull request #733 from caskdata/feature/fix-cli-help

Fix cdap-cli help message
CDAP-805 Threadlocal datasets for workers
CDAP-808: Updated examples docs, capitalize Service etc.
Merge remote-tracking branch 'upstream/release/2.6.0' into feature/cdap-808