- Added config to dedupe messages in the DB producer.

[dorner]

• Added config to log messages in the DB producer.
• Added config to provide a separate logger to the DB producer.

Pull Request Template

Description

This adds a feature to allow the DB producer to dedupe (compact) messages in a single batch. This is based on the finding that often in Rails we will update objects multiple times, which KafkaSource will translate into multiple messages. This can cut down the number of messages actually sent by a significant amount.

This also adds the ability to log messages per topic or globally.

Type of change

Please delete options that are not relevant.

• [ ] Bug fix (non-breaking change which fixes an issue)
• [X] New feature (non-breaking change which adds functionality)
• [ ] Breaking change (fix or feature that would cause existing functionality to not work as expected)
• [X] This change requires a documentation update

How Has This Been Tested?

Primarily locally for now - want to release a beta version to test in production.

Checklist:

• [X] My code follows the style guidelines of this project
• [X] I have performed a self-review of my own code
• [X] I have commented my code, particularly in hard-to-understand areas
• [X] I have made corresponding changes to the documentation
• [X] My changes generate no new warnings
• [X] I have added tests that prove my fix is effective or that my feature works
• [X] New and existing unit tests pass locally with my changes
• [X] Any dependent changes have been merged and published in downstream modules

[dorner]

@colinmroberts addressed comments and pushed a couple of fixes.