Does this also affect other RRD graphs, or only those two you mentioned? Can you please check file modification times for /var/log/reporting/rrd/*.rrd ? If only those two graphs are affected, can you please also check if the sysmond process is running? ("ps aufx|grep sysmond")
Those files should be updated in regular intervals. Can you please check if there is a hanging "system-reporter.pl" process? This process should be started every 15 minutes by the cron daemon, but it should not take more than a couple of seconds to complete it's work. Just check for this process (using "ps auxf"), and if the START time is way back just kill the process.
Those files should be updated in regular intervals. Can you please check if there is a hanging "system-reporter.pl" process? This process should be started every 15 minutes by the cron daemon, but it should not take more than a couple of seconds to complete it's work. Just check for this process (using "ps auxf"), and if the START time is way back just kill the process.