Update README.md

README.md

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 ## LAST UPDATE
 Added a new metric called "service_openvpn" which is quite simple : if the openvpn service is up/active, equals 1. If not, equals 0.
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 Added a script that restart automatically if he sees a change on the openvpn service with the help of "systemctl is-active --quiet" that returns an exit code if it's active.
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 It should look like this on your http://localhost:9176/metrics page :
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 # HELP service_openvpn Indicates whether the OpenVPN service is up (1) or down (0).