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T56: logging


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    The eight log levels of RFC 5424 (https://tools.ietf.org/html/rfc5424#page-11 ):

    • 0 Emergency: system is unusable
    • 1 Alert: action must be taken immediately
    • 2 Critical: critical conditions
    • 3 Error: error conditions
    • 4 Warning: warning conditions
    • 5 Notice: normal but significant condition
    • 6 Informational: informational messages
    • 7 Debug: debug-level messages