Unable to retrieve log file given the log type 'PEGA'

After the scheduled restart, logs are pointing to a NULL location as shown below.

On click of the null, we are getting the error “Unable to retrieve log file given the log type ‘ALERTSECURITY/dailyRollFile/SERVICES-PAL/ALERT/PEGA’ – please verify that the file appender in the prconfig.xml document use the standard appender names” inspite of all the appenders being present in prlogging.xml.

Neither changes have been made to prlogging.xml nor prconfig.xml in the recent past.

Log storage was running out of memory. Issue is fixed after clearing the memory.