Load rule from configmap

[AllenXu93]

Now NPD load rules from local file, from pod mount or builtin container; Do we have plan to support load rules from apiServer configmap content ? If so, I would like to contribute PRs for that.

[wangzhen127]

NPD's goal is to detect infra layer issues, which is one layer below the kubernetes in general. So it is recommended to reduce dependencies to other components like API server. And running NPD in system daemon mode can only depend on files.

But I know kops is using NPD in daemonset mode, so there is dependency on API server already. @hakman WDYT?

[hakman]

@wangzhen127 I would be interested on the use case more and if they just want to reload. That should be possible from mounted configmap also.

[wangzhen127]

/kind feature

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