id	summary	reporter	owner	description	type	status	priority	milestone	component	version	resolution	keywords	cc	uname	nginx_version
2646	access_log syslog message length	Vladimir		"Hello!
I use 2 types of logs, one directly to a file, there are no problems with it.
The second log is sending data to ELK using the syslog method. Everything was fine until I included requests in the log POST, they are quite large, and some of them are truncated, despite the fact that in a regular log file, which is written in parallel, this message is not truncated.
I tried to use buffer increase buffer=64k in the configuration file, but waiting for syslog it did not work, it showed that this was not possible.
Perhaps this is not an error, you need to increase the buffer somewhere for sending messages that are sent by the syslog method, but I could not find this in the documentation. Presumably, somewhere there is a message size limit of 8k.
Can you please tell me the solution to this problem?
Thank you!
online_access.log:
""statistics=%7B%22envelopes%22%*bigmessage*22%3A%22aIdEditCopy%22%2C%22secsFromStart%22%3A2595%2C%22tab%22%3A4%7D%2C%22timestamp%22%3A1717362074017%7D%5D%2C%22timestamp%22%3A1717362074021%7D&rnd=Ft85pw""

syslog:
""statistics=%7B%22envelopes%22%*bigmessage*22%3A%22aIdEditCopy%22%2C%22secsFromStart%2

***
access_log /var/log/nginx/online_access.log constime;
access_log syslog:server=elk:9102,tag=Nginx,severity=info constime;
***
"	defect	closed	minor		nginx-core	1.24.x	invalid			Linux astra 6.1.50-1-generic #astra2+ci6 SMP PREEMPT_DYNAMIC Fri Oct  6 14:38:42 UTC 2023 x86_64 GNU/Linux	"nginx version: nginx/1.24.0
built by gcc 8.3.0 (AstraLinuxSE 8.3.0-6)
built with OpenSSL 1.1.1n  15 Mar 2022
TLS SNI support enabled
configure arguments: --prefix=/usr/share/nginx --sbin-path=/usr/sbin/nginx --modules-path=/usr/share/nginx/modules --conf-path=/etc/nginx/nginx.conf --error-log-path=/var/log/nginx/error.log --http-log-path=/var/log/nginx/access.log --pid-path=/var/run/nginx.pid --lock-path=/var/run/nginx.lock --http-client-body-temp-path=/var/cache/nginx/client_temp --http-proxy-temp-path=/var/cache/nginx/proxy_temp --http-fastcgi-temp-path=/var/cache/nginx/fastcgi_temp --http-uwsgi-temp-path=/var/cache/nginx/uwsgi_temp --http-scgi-temp-path=/var/cache/nginx/scgi_temp --user=www --group=www --with-compat --with-file-aio --with-threads --with-http_addition_module --with-http_auth_request_module --with-http_dav_module --with-http_flv_module --with-http_gunzip_module --with-http_gzip_static_module --with-http_mp4_module --with-http_random_index_module --with-http_realip_module --with-http_secure_link_module --with-http_slice_module --with-http_ssl_module --with-http_stub_status_module --with-http_sub_module --with-http_v2_module --with-stream=dynamic --with-stream_realip_module --with-stream_ssl_module --with-stream_ssl_preread_module --with-http_image_filter_module=dynamic --with-cc-opt='-g -O2 -fdebug-prefix-map=/usr/local/src/nginx-1.24=. -fstack-protector-strong -Wformat -Werror=format-security -Wp,-D_FORTIFY_SOURCE=2 -fPIC' --with-ld-opt='-Wl,-z,relro -Wl,-z,now -Wl,--as-needed -pie' --add-module=/usr/local/src/nginx-module-vts-0.2.2"