feat: add tracing-tracy (#20958)

Co-authored-by: Matthias Seitz <matthias.seitz@outlook.de>
Co-authored-by: Claude Opus 4.5 <noreply@anthropic.com>

crates/node/core/Cargo.toml

@@ -82,6 +82,7 @@ jemalloc = ["reth-cli-util/jemalloc"]
 asm-keccak = ["alloy-primitives/asm-keccak"]
 keccak-cache-global = ["alloy-primitives/keccak-cache-global"]
 otlp = ["reth-tracing/otlp"]
+tracy = ["reth-tracing/tracy"]
 
 min-error-logs = ["tracing/release_max_level_error"]
 min-warn-logs = ["tracing/release_max_level_warn"]

crates/node/core/src/args/log.rs

@@ -75,6 +75,20 @@ pub struct LogArgs {
     )]
     pub samply_filter: String,
 
+    /// Emit traces to tracy. Only useful when profiling.
+    #[arg(long = "log.tracy", global = true, hide = true)]
+    pub tracy: bool,
+
+    /// The filter to use for traces emitted to tracy.
+    #[arg(
+        long = "log.tracy.filter",
+        value_name = "FILTER",
+        global = true,
+        default_value = "debug",
+        hide = true
+    )]
+    pub tracy_filter: String,
+
     /// Sets whether or not the formatter emits ANSI terminal escape codes for colors and other
     /// text formatting.
     #[arg(
@@ -148,6 +162,12 @@ impl LogArgs {
             tracer = tracer.with_samply(config);
         }
 
+        #[cfg(feature = "tracy")]
+        if self.tracy {
+            let config = self.layer_info(LogFormat::Terminal, self.tracy_filter.clone(), false);
+            tracer = tracer.with_tracy(config);
+        }
+
         let guard = tracer.init_with_layers(layers)?;
         Ok(guard)
     }