Bug 37307

What are you asking for?  Something like the env=foo argument to CustomLog  
that'll suppress Errorlog logging? 

Exactly that is something I would find useful too. 

I know situations where load balancers test http server accessibility using
probing requests. In case of https it is not uncommon, that they don't really do
a full SSL handshake and as a result you get an entry in the error_log and
ssl_engine_log every time the load balancer probes.

env=foo for Errorlog (and also the SSLlog) would be great.

The idea is very simple; Apache has only 8 directives for error log levels:
debug, info, notice, warn, error, crit, alert and emerg.

But there is no possibility to select only those error messages that we would 
like to gather.
Foe example, I would be interested of only some specific notification [notice] 
messages and some from [warn] group.
Each time I have a server crash, I open the server error log file and after 
hundreds of times reading the same line like "Disabled use of AcceptEx() 
WinSock2 API" I start to swear on my fathers grave that I know that I have 
disabled the use of "AcceptEx() WinSock2 API" in the httpd.conf file and I 
would very much like to choke that output! :(((

It would seem to me that the only way to be able to do this would be to create a new directive "SuppressErrorLogMatching" that accepts a regular expression and then check the log messages in a lower level function like log_error_core.

I would be happy to write a patch to accomplish this, but I would like input from the devs as to the feasibility.

1. Add to the conf: SuppressErrorLogMatching "Disabled use of AcceptEx"
2. Allow multiple occurrences of this directive?
3. In the startup, compile the regular expression to ensure validity and add the ap_regex_t struct to an array or as a single item (depending on whether we should allow multiple occurrences)
4. During every call to log_error_core, check the regex against the log message and return immediately if it matches

While it's all I can come up with to suit the request, I have concerns about the approach. This could easily increase load depending on the level and amount of logging. Although we would be dealing with a compiled regex, we still have to spend the time to know if it matches - adding those cycles to all log messages in debug level with something like mod_ssl dumping data would be rather nasty to do.

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