Struct TunnelClosedInput 

pub struct TunnelClosedInput<'a> {
    pub vps: &'a str,
    pub reason: TunnelCloseReason,
    pub bind: &'a str,
    pub local_port: u16,
    pub forwards_served: u64,
    pub capacity_waits: u64,
    pub duration_ms: u64,
    pub mode: &'a str,
}

Inputs for build_tunnel_closed.

B3: three of the eight fields are bare u64 counters and one is a u16 port. Passed positionally, swapping forwards_served with capacity_waits compiles and produces a plausible-looking event that misreports the tunnel’s lifetime — the exact class of silent wrongness the suppressed too_many_arguments lint was pointing at.

Fields

vps: &'a str

Registry name of the relay host.

reason: TunnelCloseReason

Why the tunnel stopped.

bind: &'a str

Effective local bind address.

local_port: u16

Effective local port (OS-assigned when 0 was requested).

forwards_served: u64

Connections accepted over the tunnel’s lifetime.

capacity_waits: u64

Times an accept waited on the concurrency semaphore.

duration_ms: u64

Wall lifetime in milliseconds.

mode: &'a str

Tunnel mode label (local, reverse, socks5, streamlocal).