feat: timer total turn metrics (#9382)

codex-rs/otel/src/lib.rs

@@ -9,7 +9,7 @@ use crate::metrics::MetricsClient;
 use crate::metrics::MetricsConfig;
 use crate::metrics::MetricsError;
 use crate::metrics::Result as MetricsResult;
-use crate::metrics::timer::Timer;
+pub use crate::metrics::timer::Timer;
 use crate::metrics::validation::validate_tag_key;
 use crate::metrics::validation::validate_tag_value;
 use crate::otel_provider::OtelProvider;

codex-rs/otel/src/metrics/timer.rs

@@ -2,6 +2,7 @@ use crate::metrics::MetricsClient;
 use crate::metrics::error::Result;
 use std::time::Instant;
 
+#[derive(Debug)]
 pub struct Timer {
     name: String,
     tags: Vec<(String, String)>,