Service Plugin（ 支持服务级插件 ）

[ydh926]

whatever you want to say to slime developers Currently, custom plug-in configurations are generally bound to routing. Distribute the plug-in configuration through per-filter-config under route/vhost. Considering that in some scenarios, the configuration of some plug-ins is similar to that of load balancing, and the same cluster shares a plug-in configuration instead of routing, which requires service plug-ins. We plan to distribute the plug-in configuration through the filter matedata under the cluster. （目前自定义的插件配置一般是跟路由绑定。通过route/vhost下的per-filter-config下发插件配置。考虑到在一些场景下，一些插件的配置与负载均衡的情况类似，相同的cluster共享一份插件配置而非路由，这就需要服务插件。 我们计划通过cluster下的filter matedata下发插件配置。）

[stale[bot]]

This issue has been automatically marked as stale because it has not had recent activity. It will be closed if no further activity occurs. Thank you for your contributions.

[YonkaFang]

after some investigation of envoy cluster filter, we'll try to contribute cluster envoyfilter support to istio and then get down to cluster/service plugin.

[jk-tonycui]

I would like to contribute, please assign to me.