Where are Nifi Stats Monitor disk usage logs which are displayed in Nifi UI like Warnings and Errors stored?

[#1]

I mean in which logs the nifi warnings and errors are stored?

[#2 · Accepted solution]

It should be in nifi-app.log... in the code it does:

context.getBulletinRepository().addBulletin(bulletin);
logger.warn(message);

The logger is a standard SLF4J logger which ends up being logback controlled by the logback.xml in the conf directory:

Logger logger = LoggerFactory.getLogger(MonitorDiskUsage.class);