By default Syslog-ng Store Box (SSB) sends an e-mail alert like this with the subject "Notification received: SSB-SNMP-MIB::ssbStatisticsError".
(If e-mail alerts have been disabled no e-mail alert is received.)
XCB-SNMP-MIB::description Skipped 5 rrd updates due to limit, first skipped id is unknown
The data visualized on the dashboard is outdated.
The data visualized in reports is outdated.
The file number limit for the statistics files has been reached.
Note: Calculate the space needed. One statistics file is approximately 170KiB.
Warning! Extreme increases in the number of statistics files may cause performance issues.
There are various solution to mitigate the issue.
Consider, that all of these solutions affect the statistics used in reports and on dashboard.
Mitigating resolution 1 - Remove needless statistics
Mitigating resolution 3 - Increase statistics sampling interval