Add a new AUDIT logging level (-5) between PANIC (-4) and NOLOG (shifted
to -6) across C++, PHP, and Perl loggers. AUDIT entries use code 'AUD'
and syslog priority LOG_NOTICE. They record who changed what, from where,
for monitors, filters, users, config, roles, groups, zones, states,
servers, storage, events, snapshots, control caps, and login/logout.
AUDIT entries have their own retention period (ZM_LOG_AUDIT_DATABASE_LIMIT,
default 1 year) separate from regular log pruning. The log pruning in
zmstats.pl and zmaudit.pl now excludes AUDIT rows from regular pruning
and prunes them independently.
Critical safety: the C++ termination logic is changed from
'if (level <= FATAL)' to 'if (level == FATAL || level == PANIC)' to
prevent AUDIT-level log calls from killing the process.
Includes db migration zm_update-1.39.1.sql to shift any stored NOLOG
config values from -5 to -6.
Co-Authored-By: Claude Opus 4.6 <noreply@anthropic.com>
