Baoyuantop commented on issue #13437:
URL: https://github.com/apache/apisix/issues/13437#issuecomment-4623064685
The error is caused by the `prometheus-cache` shared dict, not by
`prometheus-metrics`.
In APISIX 3.16, `prometheus-cache` is rendered from:
```yaml
nginx_config:
meta:
lua_shared_dict:
prometheus-cache: 100m
```
Putting `prometheus-cache` under `nginx_config.http.lua_shared_dict` will
not resize the actual cache dict. Your log shows the generated metrics text is
10517187 bytes, which is slightly larger than the default 10m cache, so the
timer cannot save cached metrics and the metrics endpoint later returns `data
is nil`.
Please move `prometheus-cache` to `nginx_config.meta.lua_shared_dict`,
restart APISIX, and verify that the generated nginx.conf contains
`lua_shared_dict prometheus-cache 100m;`.
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