Logging improvement

[foram-splunk]

Added monitoring module for metrics collection.The following metrics are getting collected :

• nozzle.queue.percentage (Shows how much internal queue is filled)
• splunk.events.dropped.count (Number of events dropped from splunk HEC)
• splunk.events.sent.count (Number of events sent to splunk)
• firehose.events.dropped.count (Number of events dropped from nozzle)
• firehose.events.received.count (Number of events recieved from firehose(websocket))
• splunk.events.throughput (Average Payload size)
• nozzle.usage.ram (RAM Usage)
• nozzle.usage.cpu (CPU Usage)
• nozzle.cache.memory.hit (Number of times it has successfully retrieved the data from memory)
• nozzle.cache.memory.miss (Number of times it has unsuccessfully tried to retrieved the data from memory)
• nozzle.cache.remote.hit (Number of times it has successfully retrieved the data from remote)
• nozzle.cache.remote.miss (Number of times it has unsuccessfully tried to retrieved the data from remote)
• nozzle.cache.boltdb.hit (Number of times it has successfully retrieved the data from BoltDB)
• nozzle.cache.boltdb.miss (Number of times it has unsuccessfully tried to retrieved the data from BoltDB)

[hvaghani221]

@foram-splunk please rebase with develop branch