xinxinh2020 opened a new issue, #8146:
URL: https://github.com/apache/apisix/issues/8146
### Description
Hi, i want to add some labels to metrics, and some labels are literals
instead of vars. I find it will be an empty string when i use literals.
Besides, i cannot find how to define vars like $upstream_addr.
```yaml
plugin_attr:
prometheus:
metrics:
http_status:
extra_labels:
- upstream_addr: $upstream_addr
- upstream_status: $upstream_status
```
Any reply would be greatly appreciated :)
### Environment
- APISIX version (run `apisix version`):
- Operating system (run `uname -a`):
- OpenResty / Nginx version (run `openresty -V` or `nginx -V`):
- 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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