docs: plugin_config support in standalone deployment mode

[mangolost]

Description

We deploy apisix in standalone mode and use apisix.yaml to config our routes.

Since routes are a lot and the plugins used are similar, we intend to use [plugin_config] to extract commonly used plugin configurations. In this case, we can just use plugin_config_id in [routes] and it appears more consice.

However, it does not work and the request fails with a status code of 503.

We notice that [plugin_config] is not mentioned in official document: https://apisix.apache.org/docs/apisix/3.2/deployment-modes/#standalone. Does is mean that [plugin_config] is not supported in standalone mode and can only be set with Admin API?

Can [plugin_config] be supported in in apisix.yaml with standalone deployment mode?

[kayx23]

Hi @mangolost , plugin configs should be supported and you may see the test case here: https://github.com/apache/apisix/blob/master/t/config-center-yaml/plugin-configs.t

I'll be updating the issue to a docs issue.

As for the 503, please make sure you have first created the plugin_config resource with the ID you would like to reference in routes. The error seems to be caused by referencing to a plugin_config ID that does not exist.