This read-write RlSyslogSeverity scalar sets the minimum severity a message must have to be readable from the in-memory log cache, with a value of notActive disabling that activity; the description notes all events are still logged to cache unless this is notActive. Admins tune it to control what shows up when browsing recent events via SNMP or the web UI without touching what's actually captured. For example, an admin investigating a specific fault temporarily lowers this threshold to informational so subtler events become visible in the cache view.