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
Marked procedure related api as deprecated.
Wrap intialize and destroy methods of HttpSerivceHandler in txExecutor
Moving keys and values to constants
Missed one
code review comments
Spark Integration: Collect system metrics from Spark
change based on review comments
Merge pull request #713 from caskdata/feature/cdap-761-deprecate-api

Marked procedure related api as deprecated.
Merge pull request #716 from caskdata/feature/spark-metrics

Spark Integration: Collect system metrics from Spark
Spark Integration: Added support for custom user metrics in Spark
Spark Integration: Modified SparkMetricsTest to support custom metrics test
Spark Integration: SparkPageRank example emits custom metrics
fixed deleting metrics upon redeployment of changed app
Small doc changes
PR comment
Merge pull request #718 from caskdata/feature/spark-custom-metrics

Spark Integration: Custom User Metrics
Merge pull request #715 from caskdata/feature/service-methods-tx-fix

CDAP-754 : Wrap initialize and destroy methods of HttpSerivceHandler in txExecutor