anchor.diff:  |4
   |`op`
   a|Mandatory string that describes the type of operation. In an _update_ event value, the `op` field value is `u`, signifying that this row changed because of an update.
  +
  +|5
  +|`ts_ms`
  +a|Optional field that displays the time at which the connector processed the event. The time is based on the system clock in the JVM running the Kafka Connect task.  +
  + +
  +In the `source` object, `ts_ms` indicates the time that the change was made in the database. By comparing the value for `payload.source.ts_ms` with the value for `payload.ts_ms`, you can determine the lag between the source database update and {prodname}.
  +
   
   |===
   
  
positive.code:       "event_serial_no": "2"
      },
      "op": "u", // <4>
      "ts_ms": 1559729998706
    }
  }
  ----
  
negative.code: * {prodname} version
  * Connector type and name
  * Database and schema names
  * Timestamp for when the change was made in the database
  * If the event was part of a snapshot
  * Name of the table that contains the new row
  * Server log offsets
  