fix broken gauge merge behavior

Author: tobz

lib/saluki-components/src/transforms/aggregate/mod.rs

@@ -533,13 +533,6 @@ impl AggregationState {
             // This means we'll always remove all-closed/empty non-counter metrics, and we _may_ remove all-closed/empty
             // counters.
             if let Some(closed_bucket_values) = am.values.split_at_timestamp(split_timestamp) {
-                trace!(
-                    metric_name = &**context.name(),
-                    metric_tags = %context.tags(),
-                    points = %closed_bucket_values,
-                    "Flushing closed buckets."
-                );
-
                 // We got some closed bucket values, so flush those out.
                 transform_and_push_metric(
                     context.clone(),

lib/saluki-event/src/metric/value/histogram.rs

@@ -225,6 +225,15 @@ impl From<f64> for HistogramPoints {
     }
 }
 
+impl From<(u64, f64)> for HistogramPoints {
+    fn from((ts, value): (u64, f64)) -> Self {
+        let mut histogram = Histogram::default();
+        histogram.insert(value, SampleRate::unsampled());
+
+        Self(TimestampedValue::from((ts, histogram)).into())
+    }
+}
+
 impl<const N: usize> From<[f64; N]> for HistogramPoints {
     fn from(values: [f64; N]) -> Self {
         let mut histogram = Histogram::default();
@@ -236,6 +245,33 @@ impl<const N: usize> From<[f64; N]> for HistogramPoints {
     }
 }
 
+impl<const N: usize> From<(u64, [f64; N])> for HistogramPoints {
+    fn from((ts, values): (u64, [f64; N])) -> Self {
+        let mut histogram = Histogram::default();
+        for value in values {
+            histogram.insert(value, SampleRate::unsampled());
+        }
+
+        Self(TimestampedValue::from((ts, histogram)).into())
+    }
+}
+
+impl<const N: usize> From<[(u64, f64); N]> for HistogramPoints {
+    fn from(values: [(u64, f64); N]) -> Self {
+        Self(
+            values
+                .into_iter()
+                .map(|(ts, value)| {
+                    let mut histogram = Histogram::default();
+                    histogram.insert(value, SampleRate::unsampled());
+
+                    (ts, histogram)
+                })
+                .into(),
+        )
+    }
+}
+
 impl<'a> From<&'a [f64]> for HistogramPoints {
     fn from(values: &'a [f64]) -> Self {
         let mut histogram = Histogram::default();