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This change will introduce an /admin/loggers endpoint to the Connect worker . In addition, a new configuration property admin.listeners will be provided to specify which listener to use for the /admin endpointthat can be used to get/modify the log levels of any named loggers in the Connect worker. The /admin/loggers endpoint will support the following operations:

Get a list of all named loggers

$ curl -Ss http://localhost:8083/admin/loggers | jq
[
  ...
  "org.apache.kafka.connect.runtime.WorkerSinkTask": {
    "level": "INFO"
  },
  "org.apache.kafka.connect.runtime.WorkerSourceTask": {
    "level": "DEBUG"
  },
  ...
]

Get the log level of a specific logger

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Set the log level of a specific logger

Use PUT to set the level of a logger. The API returns a list of loggers whose levels were modified.

$ curl -Ss -X PUT '{"level": "TRACE"}' http://localhost:8083/admin/loggers/org.apache.kafka.connect.runtime.WorkerSinkTask
{
  modified: [
    "org.apache.kafka.connect.runtime.WorkerSinkTask"
  ]
}

Setting the log level of an ancestor (for example, org.apache.kafka.connect as opposed to a classname) will update the levels of all child classes. Any levels previously set by this API will also be overridden. 

$ curl -Ss -X PUT '{"level": "TRACE"}' http://localhost:8083/admin/loggers/org.apache.kafka.connect
{
  modified: no output

Configuration Changes

[
    ...
    "org.apache.kafka.connect.runtime.WorkerSinkTask",
    "org.apache.kafka.connect.runtime.WorkerSourceTask",
    ...
  ]
}

The above call returns org.apache.kafka.connect.runtime.WorkerSinkTask and org.apache.kafka.connect.runtime.WorkerSourceTask because they fall under the specified ancestor. If no name parameter is present, this API will set the log level of the root logger.

Configuration Changes

In addition, a new configuration property admin.listeners will be provided to specify which listener to use for the /admin endpoint. An additional configuration property will be used to control how the admin endpoint is made available.

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