public static void debug(String msg) {
        if(isEnabledFor(Level.DEBUG)) {
            getTarget().println(SLF4J_DEBUG_PREFIX + msg);
        }
    }
Report an internal message of level DEBUG. Message text is prefixed with the string "SLF4J(D)",
with (D) standing as a shorthand for DEBUG.

<p>Messages of level DEBUG are be enabled when the {@link #SLF4J_INTERNAL_VERBOSITY_KEY}
system property is set to "DEBUG" and disabled when set to "INFO", "WARN" or "ERROR". By default,
{@link #SLF4J_INTERNAL_VERBOSITY_KEY} is set to "INFO".</p>

@param msg the message text
@since 2.0.16
slf4j-api/src/main/java/org/slf4j/helpers/Reporter.java