Autoscale the graph vertically

bare-metrics-gui/src/graph.rs

@@ -116,6 +116,20 @@ pub struct ScalarWindow {
     pub y_axis: RangeInclusive<f64>,
 }
 
+impl ScalarWindow {
+    pub fn summarise_in_place(&mut self) {
+        let mut min_point = f64::INFINITY;
+        let mut max_point = f64::NEG_INFINITY;
+
+        for (_, point) in self.points.iter() {
+            min_point = min_point.min(*point);
+            max_point = max_point.max(*point);
+        }
+
+        self.y_axis = min_point..=max_point;
+    }
+}
+
 pub struct MetricsLogReadingRequester {
     pub shared: Arc<MetricsLogReadingShared>,
     pub tx: Sender<MetricsLogReaderMessage>,
@@ -529,6 +543,13 @@ impl<R: Read + Seek> MetricsLogReaderManager<R> {
                 .insert(metric_id, unsummarised_histogram.summarise());
         }
 
+        for (metric_id, gauge) in metrics_window.gauges.iter_mut() {
+            gauge.summarise_in_place();
+        }
+        for (metric_id, counter) in metrics_window.counters.iter_mut() {
+            counter.summarise_in_place();
+        }
+
         Ok(metrics_window)
     }