Cleaning up compiler warnings.

src/init_tracing.rs

@@ -1,6 +1,6 @@
 use tracing_subscriber::layer::SubscriberExt;
 use tracing_subscriber::util::SubscriberInitExt;
-use tracing_subscriber::EnvFilter;
+// use tracing_subscriber::EnvFilter;
 
 pub fn init_telemetry() -> Result<(), Box<dyn std::error::Error>> {
     // let env_filter = EnvFilter::try_from_default_env().unwrap_or(EnvFilter::new("warn"));