Logger is the standard logger for the Gardener which is used for all messages which are not Shoot cluster specific.
AddWriter returns a logger that uses the tests writer (e.g., GingkoWriter) as output channel
NewFieldLogger extends an existing logrus logger and adds the provided additional field. Example output: time="2017-06-08T13:00:49+02:00" level=info msg="something" <fieldKey>=<fieldValue>.
NewLogger creates a new logrus logger. It uses STDERR as output channel and evaluates the value of the --log-level command line argument in order to set the log level. Example output: time="2017-06-08T13:00:28+02:00" level=info msg="gardener started successfully".
NewNopLogger instantiates a new logger that logs to ioutil.Discard.
NewShootLogger extends an existing logrus logger and adds an additional field containing the Shoot cluster name and the project in the Garden cluster to the output. If an <operationID> is provided it will be printed for every log message. Example output: time="2017-06-08T13:00:49+02:00" level=info msg="Creating namespace in seed cluster" shoot=core/crazy-botany.