Rust 2018 cleanup

metrics/Cargo.toml

@@ -6,6 +6,7 @@ authors = ["Solana Maintainers <maintainers@solana.com>"]
 repository = "https://github.com/solana-labs/solana"
 license = "Apache-2.0"
 homepage = "https://solana.com/"
+edition = "2018"
 
 [dependencies]
 influx_db_client = "0.3.6"

metrics/src/lib.rs

@@ -1,16 +1,7 @@
-pub extern crate influx_db_client;
-#[macro_use]
-extern crate lazy_static;
-extern crate reqwest;
-#[macro_use]
-extern crate log;
-extern crate solana_sdk;
-extern crate sys_info;
-
 mod metrics;
-pub use metrics::flush;
-pub use metrics::query;
-pub use metrics::set_panic_hook;
-pub use metrics::submit;
 
+pub use crate::metrics::flush;
+pub use crate::metrics::query;
+pub use crate::metrics::set_panic_hook;
+pub use crate::metrics::submit;
 pub use influx_db_client as influxdb;

metrics/src/metrics.rs

@@ -1,8 +1,8 @@
 //! The `metrics` module enables sending measurements to an InfluxDB instance
 
-extern crate reqwest;
-
 use influx_db_client as influxdb;
+use lazy_static::lazy_static;
+use log::*;
 use solana_sdk::hash::hash;
 use solana_sdk::timing;
 use std::env;
@@ -267,8 +267,6 @@ pub fn set_panic_hook(program: &'static str) {
 
 #[cfg(test)]
 mod test {
-    extern crate rand;
-
     use super::*;
     use std::sync::atomic::{AtomicUsize, Ordering};