[GOBBLIN-589] Add more Gobblin tracking metrics in KafkaExtractorTopicMetadata event

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 0.14.0
• Assignee: Unassigned
• Reporter: Carl Shen
• Created: 13/Sep/18 20:36
• Updated: 17/Sep/18 23:29
• Resolved: 17/Sep/18 18:04

Description

Add start/stop fetch epoch times so that true extractor ingestion values can be used instead of estimations.

Add previous{start/stop fetch epoch times, low/high watermarks}: saves extra queries required to do lag operations for monitoring purposes.

Add partitionTotalSize and undecodableMessageCount