ConfigureEarlyLogging installs our logging adapters, and enables early logging to screen if it is enabled by either the TYPHA_EARLYLOGSEVERITYSCREEN or TYPHA_LOGSEVERITYSCREEN environment variable.

ConfigureLogging uses the resolved configuration to complete the logging configuration.

FormatForSyslog formats logs in a way tailored for syslog.

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

Formatter is our custom log formatter, which mimics the style used by the Python version of Typha.

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