Add MySQL Connector metric to expose "number of filtered events"

Expose metric for "Number of Events Filtered"

MySQL binlog connector currently exposes the ability to filter processing events based on database name (database.whitelist, database.blacklist), by table name (table.whitelist, table.blacklist), and/or by column name (column.blacklist). Currently when a record is filtered based on these criteria, it is exposed by a debug log statement.

Lets improve upon this by exposing the number of events filtered by these configuration values via a new metric named "numberOfFilteredEvents".

Items covered under ticket

• Add new metric.
• Test coverage.
• Update documentation for metric.