Fix RUST_LOG env overrides

Adapted workaround from tokio-rs/tracing#1466

shotover-proxy/src/runner.rs

@@ -1,3 +1,4 @@
+use std::env;
 use std::net::SocketAddr;
 
 use anyhow::{anyhow, Result};
@@ -118,7 +119,18 @@ impl TracingState {
 
  let builder = tracing_subscriber::fmt()
  .with_writer(non_blocking)
- .with_env_filter(log_level)
+ .with_env_filter({
+ // Override directives using RUST_LOG environment variable. Workaround for tokio-rs/tracing#512.
+ let overrides = env::var(EnvFilter::DEFAULT_ENV).ok();
+ let directives = [Some(log_level), overrides.as_deref()]
+ .iter()
+ .flat_map(Option::as_deref)
+ .map(str::trim)
+ .filter(|s| !s.is_empty())
+ .collect::<Vec<_>>()
+ .join(",");
+ EnvFilter::new(directives)
+ })
  .with_filter_reloading();
  let handle = builder.reload_handle();