DNSC-590 — Non-periodical cleanup did not clear cache sufficiently
Non-periodical cleanup is called when size of cache exceeds configured limit ('max-hosts' or 'max-domains') and cleares all items currently not used (not only expired and recently unused like periodical cleanup). If even after cleanup, the size of cache exceeds limit, this message is issued.
Proxy continues in work. However, the limits of cache size should be increased as soon as possible (see Cache section of dns-proxy(8) manual page).