TCPS-713 — Log level decremented in response to a received signal
The log level (maximum severity code which will be logged) can be set between I (6, LOG_INFO) to F (9, FULL_DEBUG). When the proxy receives signal SIGUSR2, the log level is decremented by one, i.e., only more severe messages will be logged. Signalling a child process changes the log level only in this single process.