Format of messages posted to error_log?

[Sergey A. Osokin]

On Tue, Apr 12, 2022 at 05:04:19PM +0000, Scott Snow wrote:
> Sergey -
> Thanks for the quick reply.
> 
> Note I am not asking after format of message content akin to what's
> available for access_log, just the interpretation of the numerical parts
> of the apparent pattern in the error_log messages posted:
> "[<severity>]  <number>#<number> : <message text>"
> 
> Perhaps you mean even the "[<severity>] <number>#<number>" isn't fixed
> or necessarily present; in that case, is there something distinguishing
> error_log entries that do not follow this pattern?

Well, those two numbers are processId#connectionId, please visit the
following link to get more details:
https://nginx.org/en/docs/dev/development_guide.html#logging

--
Sergey A. Osokin