Add metric option to the config

[Iv]

Issue Details

It would be nice to have the ability to specify the metric for failovers.
It would be easier to make failover connections.

Proposed solution

Add an optional metric option to the client config.
Apply metric to the routes created.

Alternative solution

No response

[anyakushin]

@Iv Hello, could you please explain what do you mean? What behaviour do you want to achieve and what is the OS?

[Iv]

I would like to use the two failover tunnels to the two different servers.

But you are right. It's not that straightforward. Just a metric would not work.

[anyakushin]

Hmm, so basically you want specify multiple endpoints (server address, certs, creds) in the client's config, mark their priority (metric) and let the client connect to the available one with priority order respected?