I have modified the configuration of rsyslogd to disable RSYSLOG_TraditionalFileFormat.
But still the apache log /var/log/apache/error.log is displaying only second-precission.
Is there something else that needs to be configured?
At http://httpd.apache.org/docs/current/mod/mod_log_config.html you see differemt time formats including mili seconds Just change from
%t
to
%{%d/%b/%Y:%T}t-%{msec_frac}t for miliseconds
or
%{%d/%b/%Y:%T}t-%{usec_frac}t for microsecs
Example: 16/Mar/2013:22:44:34-634 16/Mar/2013:22:44:34-634200
Documenation apache
%t Time the request was received, in the format [18/Sep/2011:19:18:28 -0400]. The last number indicates the timezone offset from GMT
%{format}t The time, in the form given by format, which should be in an extended strftime(3) format (potentially localized). If the format starts with begin: (default) the time is taken at the beginning of the request processing. If it starts with end: it is the time when the log entry gets written, close to the end of the request processing. In addition to the formats supported by strftime(3), the following format tokens are supported:
sec number of seconds since the Epoch
msec number of milliseconds since the Epoch
usec number of microseconds since the Epoch
msec_frac millisecond fraction
usec_frac microsecond fraction
These tokens can not be combined with each other or strftime(3) formatting in the same format string. You can use multiple %{format}t tokens instead.
strftime(3) formatting http://man7.org/linux/man-pages/man3/strftime.3.html
来源：https://stackoverflow.com/questions/15405719/increase-precision-of-apache-log-to-include-milliseconds