Unsigned external plugin

[cao000]

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[cao000]

grafana: 7.2.1 docker image
prometheus: latest docker image
after docker is ran, get the following information:
prometheus, version 2.23.0 (branch: HEAD, revision: 26d89b4b0776fe4cd5a3656dfa520f119a375273)
build user: root@37609b3a0a21
build date: 20201126-10:56:17
go version: go1.15.5
platform: linux/amd64