LoggerOrNull ensures non-nil logger is passed in or creates a Null Logger.

NewLogger returns a new logger that includes app and deploy key/value pairs in each log line.

NewNullLogger returns a logger that discards the output useful for testing.

NewSampleLogger creates a rate limited logger that samples logs.

ReportPanic attempts to report the panic to rollbar via the logrus.

SaramaLogger takes FieldLogger and returns a saramaLogger.

Config for logger.