[jira] [Created] (STORM-3759) Additional Trident Kafka Spout Metrics

["Jonathan Poholarz (Jira)" <ji...@apache.org>]

Jonathan Poholarz created STORM-3759:
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             Summary: Additional Trident Kafka Spout Metrics
                 Key: STORM-3759
                 URL: https://issues.apache.org/jira/browse/STORM-3759
             Project: Apache Storm
          Issue Type: New Feature
          Components: storm-kafka-client
            Reporter: Jonathan Poholarz


The Trident Kafka Spout/Emitter does not seem to measure a couple metrics that my team has found useful over the years using the spout.

*Event emit rate*
 Having a count of how many events are being emitted by the spout can track the rate at which the spout is consuming from the kafka topic(s). If this rate decreases, it signals performance issues to investigate.  This metric has helped my team track the overall health of our Kafka spouts.

*Kafka Spout Max Lag*
 This gauge value monitors the backlog of events.  It helps determine if:
 * a. the spout is not emitting fast enough to keep up with the incoming data, or
 * b. the spout is current and Kafka topic delayed.

This metric can be used to distinguish between these two cases and determine the source of the slowdown.  It has helped my team better understand delays.



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