yangxikun opened a new issue #3286:
URL: https://github.com/apache/apisix/issues/3286
### Issue description
Our custom plugins rely on
`apisix.plugins.prometheus.exporter.get_prometheus()` return an initialized
prometheus instance to create metrics.
### Environment
* apisix version (cmd: `apisix version`): 2.2
### What's the actual result? (including assertion message & call stack if
applicable)
When apisix start, custom plugins init first, and
`apisix.plugins.prometheus.exporter.get_prometheus()` return nil, cause error
`attempt to index a nil value`.
apisix/plugin.lua:
```lua
function _M.init_worker()
_M.load()
-- some plugins need to be initialized in init* phases
if ngx.config.subsystem == "http" then
require("apisix.plugins.prometheus.exporter").init()
end
......
end
```
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