feat(otlp): histogram count limits now configurable (#1913)

* feat(otlp): histogram count limits now configurable

* fix(otlp): set new field to pass validation suite

* feat(otlp): enforce sensible minimum defaults

Author: lucastemb

CHANGELOG.md

@@ -11,7 +11,8 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - OpenTelemetry metric payloads now prefix generated metric names with their
   metric kind to simplify intake debugging.
 - OpenTelemetry cumulative metric generation now updates cumulative sums using
-  aggregation temporality and preserves cumulative histogram min/max bounds.
+  aggregation temporality, preserves cumulative histogram min/max bounds, and
+  supports configurable histogram count limits.
 - HTTP blackhole now supports an `openmetrics` body variant for generated
   Prometheus/OpenMetrics scrape responses.
 - Updated to rand 0.10.x

lading_payload/benches/opentelemetry_metric.rs

@@ -30,6 +30,7 @@ fn opentelemetry_metric_setup(c: &mut Criterion) {
                     metrics_per_scope: ConfRange::Inclusive { min: 1, max: 128 },
                     attributes_per_metric: ConfRange::Inclusive { min: 0, max: 255 },
                 },
+                ..Default::default()
             };
             let _ot = OpentelemetryMetrics::new(config, MIB, &mut rng)
                 .expect("failed to create metrics generator");
@@ -60,6 +61,7 @@ fn opentelemetry_metric_throughput(c: &mut Criterion) {
                             metrics_per_scope: ConfRange::Inclusive { min: 1, max: 128 },
                             attributes_per_metric: ConfRange::Inclusive { min: 0, max: 255 },
                         },
+                        ..Default::default()
                     };
                     let ot = OpentelemetryMetrics::new(config, size, &mut rng)
                         .expect("failed to create metrics generator");