Add hostname to metrics on panic

Cargo.toml

@@ -89,6 +89,7 @@ sha2 = "0.7.0"
 serde = "1.0.27"
 serde_derive = "1.0.27"
 serde_json = "1.0.10"
+sys-info = "0.5.6"
 tokio = "0.1"
 tokio-codec = "0.1"
 tokio-core = "0.1.17"

src/bin/fullnode.rs

@@ -18,7 +18,6 @@ use solana::wallet::request_airdrop;
 use std::fs::File;
 use std::net::{IpAddr, Ipv4Addr, SocketAddr};
 use std::process::exit;
-//use std::time::Duration;
 
 fn main() -> () {
     logger::setup();

src/lib.rs

@@ -72,6 +72,7 @@ extern crate serde_derive;
 extern crate pnet_datalink;
 extern crate serde_json;
 extern crate sha2;
+extern crate sys_info;
 extern crate untrusted;
 
 #[cfg(test)]

src/metrics.rs

@@ -6,6 +6,7 @@ use std::sync::mpsc::{channel, Receiver, RecvTimeoutError, Sender};
 use std::sync::{Arc, Barrier, Mutex, Once, ONCE_INIT};
 use std::thread;
 use std::time::{Duration, Instant};
+use sys_info::hostname;
 use timing;
 
 #[derive(Debug)]
@@ -219,6 +220,12 @@ pub fn set_panic_hook(program: &'static str) {
                             None => "?".to_string(),
                         }),
                     )
+                    .add_field(
+                        "host",
+                        influxdb::Value::String(
+                            hostname().unwrap_or_else(|_| "?".to_string())
+                        ),
+                    )
                     .to_owned(),
             );
             // Flush metrics immediately in case the process exits immediately