Issue description

always log not found broker after kafka-logger kafka broker up. until reload apisix.

Environment

• apisix version (cmd: apisix version): 2.10.1
• OS (cmd: uname -a):Linux test 3.10.0-957.el7.x86_64 SMP Thu Nov 8 23:39:32 UTC 2018 x86_64 x86_64 x86_64 GNU/Linux
• OpenResty / Nginx version (cmd: nginx -V or openresty -V):
  nginx version: openresty/1.19.3.2
  built by gcc 4.8.5 20150623 (Red Hat 4.8.5-44) (GCC)
  built with OpenSSL 1.1.1l 24 Aug 2021
  TLS SNI support enabled
  configure arguments: --prefix=/duitang/dist/sys/openresty/nginx --with-cc-opt='-O2 -DAPISIX_BASE_VER=0.0.0 -DNGX_LUA_ABORT_AT_PANIC -I/usr/local/openresty/zlib/include -I/usr/local/openresty/pcre/include -I/usr/local/openresty/openssl111/include' --add-module=../ngx_devel_kit-0.3.1 --add-module=../echo-nginx-module-0.62 --add-module=../xss-nginx-module-0.06 --add-module=../ngx_coolkit-0.2 --add-module=../set-misc-nginx-module-0.32 --add-module=../form-input-nginx-module-0.12 --add-module=../encrypted-session-nginx-module-0.08 --add-module=../srcache-nginx-module-0.32 --add-module=../ngx_lua-0.10.19 --add-module=../ngx_lua_upstream-0.07 --add-module=../headers-more-nginx-module-0.33 --add-module=../array-var-nginx-module-0.05 --add-module=../memc-nginx-module-0.19 --add-module=../redis2-nginx-module-0.15 --add-module=../redis-nginx-module-0.3.7 --add-module=../ngx_stream_lua-0.0.9 --with-ld-opt='-Wl,-rpath,/duitang/dist/sys/openresty/luajit/lib -Wl,-rpath,-L/usr/local/openresty/zlib/lib -L/usr/local/openresty/pcre/lib -L/usr/local/openresty/openssl111/lib -Wl,-rpath,/usr/local/openresty/zlib/lib:/usr/local/openresty/pcre/lib:/usr/local/openresty/openssl111/lib' --add-module=/duitang/dist/opt/builder/output/openresty-1.19.3.2/../ngx_multi_upstream_module --add-module=/duitang/dist/opt/builder/output/openresty-1.19.3.2/../apisix-nginx-module --add-module=/duitang/dist/opt/builder/output/openresty-1.19.3.2/../lua-var-nginx-module --with-poll_module --with-pcre-jit --with-stream --with-stream_ssl_module --with-stream_ssl_preread_module --with-http_v2_module --without-mail_pop3_module --without-mail_imap_module --without-mail_smtp_module --with-http_stub_status_module --with-http_realip_module --with-http_addition_module --with-http_auth_request_module --with-http_secure_link_module --with-http_random_index_module --with-http_gzip_static_module --with-http_sub_module --with-http_dav_module --with-http_flv_module --with-http_mp4_module --with-http_gunzip_module --with-threads --with-compat --with-stream --with-http_ssl_module
• etcd version, if have (cmd: run curl http://127.0.0.1:9090/v1/server_info to get the info from server-info API):{"version":"2.10.1","boot_time":1641439475,"etcd_version":"3.5.0","up_time":83420,"last_report_time":1641522886,"id":"8d53dda0-5ec2-44b6-872c-70f18b0397a8","hostname":"wvr-ngxweb-0-20.duitang.net"}
• apisix-dashboard version, if have:
• the plugin runner version, if the issue is about a plugin runner (cmd: depended on the kind of runner):
• luarocks version, if the issue is about installation (cmd: luarocks --version):

Steps to reproduce

1. use kafka logger
2. make karka borker down
3. until apisix error log apprear like 'not found borker' logs.
4. make kafka borker up
5. apisix not auto recover

Actual result

after kafka borker up , send logs.

Error log

buffered messages send to kafka err: not found broker, retryable: true, ....

Expected result

notings