yujinchoi-94 opened a new issue, #9848:
URL: https://github.com/apache/apisix/issues/9848
### Description
Hi,
I'm trying to use recently released loki-logger plugin.
I'm adding more nginx related labels in log_labels field.
However, nginx label doesn't work and getting error like this.
```
2023/07/17 04:39:17 [error] 49#49: *20640837 lua entry thread aborted:
runtime error: /usr/local/apisix/apisix/core/utils.lua:299: attempt to index
upvalue '_ctx' (a nil value)
stack traceback:
coroutine 0:
/usr/local/apisix/apisix/core/utils.lua: in function 'replace'
/usr/local/openresty/lualib/resty/core/regex.lua:1003: in function
're_gsub'
/usr/local/apisix/apisix/core/utils.lua:324: in function 'resolve_var'
/usr/local/apisix/apisix/plugins/loki-logger.lua:201: in function 'func'
/usr/local/apisix/apisix/utils/batch-processor.lua:88: in function
</usr/local/apisix/apisix/utils/batch-processor.lua:80>, context: ngx.timer,
client: 10.192.169.127, server: 0.0.0.0:9080
```
Here's what I've tried
```
...
- config:
endpoint_addrs:
- http://loki-loki-distributed-gateway.monitor.svc.cluster.local:80
include_req_body: true
include_req_body_expr:
- - http_response_status
- ~*
- "200"
include_resp_body: true
include_resp_body_expr:
- - http_response_status
- ~*
- "200"
log_labels:
host: $host
job: apisix
method: $request_method
```
Is there anything wrong with the above configuration?
Thanks in advance :)
### Environment
- APISIX version (run `apisix version`):
```
apisix version
/usr/local/openresty//luajit/bin/luajit ./apisix/cli/apisix.lua version
3.4.0
```
- Operating system (run `uname -a`):
```
uname -a
Linux dev-apisix-95d499896-n4745 5.10.184-175.731.amzn2.x86_64 #1 SMP Tue
Jun 27 21:48:55 UTC 2023 x86_64 GNU/Linux
```
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
```
nginx -V
nginx version: openresty/1.21.4.1
built by gcc 10.2.1 20210110 (Debian 10.2.1-6)
built with OpenSSL 1.1.1s 1 Nov 2022
TLS SNI support enabled
configure arguments: --prefix=/usr/local/openresty/nginx --with-cc-opt='-O2
-DAPISIX_BASE_VER=1.21.4.1.8
-DNGX_GRPC_CLI_ENGINE_PATH=/usr/local/openresty/libgrpc_engine.so
-DNGX_HTTP_GRPC_CLI_ENGINE_PATH=/usr/local/openresty/libgrpc_engine.so
-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-0.33
--add-module=../form-input-nginx-module-0.12
--add-module=../encrypted-session-nginx-module-0.09
--add-module=../srcache-nginx-module-0.32 --add-module=../ngx_lua-0.10.21
--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-0.3.9 --ad
d-module=../ngx_stream_lua-0.0.11
--with-ld-opt='-Wl,-rpath,/usr/local/openresty/luajit/lib
-Wl,-rpath,/usr/local/openresty/wasmtime-c-api/lib
-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=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../mod_dubbo-1.0.2
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../ngx_multi_upstream_module-1.1.1
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../apisix-nginx-module-1.12.0
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../apisix-nginx-module-1.12.0/src/stream
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../apisix-nginx-module-1.12.0/src/meta
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../wasm-nginx-module-0.6.4
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../lua-var-nginx-module-v0.5.3
--add-module=/tmp/tmp.kOo9UFlgbS/openresty-1.21.4.1/../grp
c-client-nginx-module-v0.4.2 --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 relevant (run `curl
http://127.0.0.1:9090/v1/server_info`):
- APISIX Dashboard version, if relevant:
- Plugin runner version, for issues related to plugin runners:
- LuaRocks version, for installation issues (run `luarocks --version`):
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