don't modify the sketch if count is bigger than u32

Author: tony-resendiz

lib/vector-core/src/metrics/ddsketch.rs

@@ -779,8 +779,6 @@ impl AgentDDSketch {
     /// ## Errors
     ///
     /// Returns an error if a bucket size is greater that `u32::MAX`.
-    #[allow(clippy::cast_possible_truncation)]
-    #[allow(clippy::cast_precision_loss)]
     pub fn transform_to_sketch(mut metric: Metric) -> Result<Metric, &'static str> {
         let sketch = match metric.data_mut().value_mut() {
             MetricValue::Distribution { samples, .. } => {
@@ -794,18 +792,18 @@ impl AgentDDSketch {
                 buckets,
                 sum,
                 count,
-                ..
             } => {
                 let delta_buckets = mem::take(buckets);
                 let mut sketch = AgentDDSketch::with_agent_defaults();
                 sketch.insert_interpolate_buckets(delta_buckets)?;
 
-                let orig_sum = *sum;
-                let orig_count = *count;
-                if orig_count > 0 {
+                if let Ok(count) = u32::try_from(*count)
+                    && count > 0
+                {
+                    let orig_sum = *sum;
+                    sketch.count = count;
                     sketch.sum = orig_sum;
-                    sketch.count = orig_count as u32;
-                    sketch.avg = orig_sum / orig_count as f64;
+                    sketch.avg = orig_sum / f64::from(count);
                 }
 
                 Some(sketch)