Enum DiscoverySource 

pub enum DiscoverySource {
    Static(Vec<String>),
    EnvPrefix(String),
    File(String),
    Dns {
        hostname: String,
        port: u16,
    },
}

Controls how BackendPool discovers backend addresses.

Variants

Static(Vec<String>)

Fixed list of "host:port" addresses — never refreshed.

EnvPrefix(String)

Scan environment variables PREFIX_0, PREFIX_1, … until one is absent.

File(String)

Read one host:port per line from a file. Blank lines and lines starting with # are ignored.

Dns

Resolve hostname via A-record DNS lookup; format each IP as ip:port.

Fields

hostname: String

port: u16