Skip reading counters and gauges with NaN value.

Signed-off-by: Caleb Metz <[email protected]>

Author: cmetz100

lading/src/target_metrics/prometheus.rs

@@ -276,6 +276,11 @@ pub(crate) async fn scrape_metrics(
                     }
                 };
 
+                if value.is_nan() {
+                    warn!("Skipping NaN guage value");
+                    continue;
+                }
+
                 gauge!(format!("target/{name}"), &all_labels.unwrap_or_default()).set(value);
             }
             Some(MetricType::Counter) => {
@@ -287,6 +292,11 @@ pub(crate) async fn scrape_metrics(
                     }
                 };
 
+                if value.is_nan() {
+                    warn!("Skipping NaN counter value");
+                    continue;
+                }
+
                 let value = if value < 0.0 {
                     warn!("Negative counter value unhandled");
                     continue;