fix(host_metrics source): fix tcp netlink bug

.github/actions/spelling/allow.txt

@@ -355,6 +355,7 @@ netcat
 netdata
 Netflix
 netlify
+netlink
 Neue
 neuronull
 Nextbook

changelog.d/22487_tcp_netlink_parsing.fix.md

@@ -0,0 +1,3 @@
+Fixed a `host_metrics` source issue that caused tcp metrics collection to fail with "Could not parse netlink response: invalid netlink buffer" errors on Linux systems.
+
+authors: mushrowan

src/sources/host_metrics/tcp.rs

@@ -241,10 +241,12 @@ async fn fetch_netlink_inet_headers(addr_family: u8) -> Result<Vec<InetResponseH
         .await
         .context(NetlinkSendSnafu)?;
 
-    let mut receive_buffer = vec![0; 4096];
     let mut inet_resp_hdrs = Vec::with_capacity(32); // Pre-allocate with an estimate
 
-    while let Ok(()) = socket.recv(&mut &mut receive_buffer[..]).await {
+    while let Ok((receive_buffer, _addr)) = socket.recv_from_full().await {
+        if receive_buffer.is_empty() {
+            break;
+        }
         let done = parse_netlink_messages(&receive_buffer, &mut inet_resp_hdrs)?;
         if done {
             break;