AppendTime appends a time to the buffer in our format "2006-01-02 15:04:05.000".

ConfigureLoggingForTestingT configures logrus to write to the logger of the given testing.T.

FilterLevels returns all the logrus.Level values <= maxLevel.

FormatForSyslog formats logs in a way tailored for syslog.

NewRateLimitedLogger returns a RateLimitedLogger which can be used for rate limited logging.

RedirectLogrusToTestingT redirects logrus output to the given testing.T.

SafeParseLogLevel parses a string version of a logrus log level, defaulting to logrus.PanicLevel on failure.

FieldForceFlush is a field name used to signal to the BackgroundHook that it should flush the log after this message.

FileNameUnknown is the string used in logs if the filename/line number cannot be determined.

BackgroundHook is a logrus Hook that (synchronously) formats each log and sends it to one or more Destinations for writing on a background thread.

Formatter is our custom log formatter designed to balance ease of machine processing with human readability.

NullWriter is a dummy writer that always succeeds and does nothing.

TestingTWriter adapts a *testing.T as a Writer so it can be used as a target for logrus.