Numbered log prefix
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What is the <171>1 that prepends this log entry? I running 21.02.2 on a SG-3100
<171>1 2021-04-19T16:34:57.000000-04:00 pfsence.xxxxxxxxxxxx.com nginx - - - 2021/04/19 16:34:57 [error] 74190#100270: *11565 open() "/usr/local/www/robots.txt" failed (2: No such file or directory), client: 192.168.5.194, server: , request: "GET /robots.txt HTTP/2.0", host: "192.168.5.1"
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It's a syslog Priority value (facility+severity). See RFC 5424.
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