remove extraneous import, add recorders_len and targets_len

Author: joshka

metrics-tracing-context/src/label_filter.rs

@@ -1,6 +1,6 @@
 //! Label filtering.
 
-use std::{collections::HashSet, fmt::Debug};
+use std::collections::HashSet;
 
 use metrics::{KeyName, Label};
 

metrics-util/src/layers/fanout.rs

@@ -105,7 +105,9 @@ pub struct Fanout {
 
 impl fmt::Debug for Fanout {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("Fanout").finish_non_exhaustive()
+        f.debug_struct("Fanout")
+            .field("recorders_len", &self.recorders.len())
+            .finish_non_exhaustive()
     }
 }
 
@@ -166,7 +168,9 @@ pub struct FanoutBuilder {
 
 impl fmt::Debug for FanoutBuilder {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
-        f.debug_struct("FanoutBuilder").finish_non_exhaustive()
+        f.debug_struct("FanoutBuilder")
+            .field("recorders_len", &self.recorders.len())
+            .finish_non_exhaustive()
     }
 }
 

metrics-util/src/layers/router.rs

@@ -21,6 +21,7 @@ impl fmt::Debug for Router {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("Router")
             .field("global_mask", &self.global_mask)
+            .field("targets_len", &self.targets.len())
             .field("counter_routes", &self.counter_routes)
             .field("gauge_routes", &self.gauge_routes)
             .field("histogram_routes", &self.histogram_routes)
@@ -103,6 +104,7 @@ impl fmt::Debug for RouterBuilder {
     fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
         f.debug_struct("RouterBuilder")
             .field("global_mask", &self.global_mask)
+            .field("targets_len", &self.targets.len())
             .field("counter_routes", &self.counter_routes)
             .field("gauge_routes", &self.gauge_routes)
             .field("histogram_routes", &self.histogram_routes)