Custom DNS resolution removal

Vector once again follows the guidance of the host on DNS lookups.

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In Vector 0.10.0, we no longer support custom DNS servers. This feature was adding considerable code complexity and is better handled outside of Vector through tools like systemd-resolved.

In the interest of keeping Vector lean and understandable, as well as improving it’s maintainability, we’ve chosen to remove it.

Upgrade Guide

Make the following changes in your vector.toml file:

-  dns_servers = [...]

Enabling DNS outside of Vector

If you were using this feature you may need to configure your host to consult DNS. This can be achieved through tools like systemd-resolved. Alternatively, you can wrap Vector in a container and set the DNS for the container. This can be done via --dns in podman/docker or