Histogram buckets only used for specific features

Author: emschwartz

autometrics/src/lib.rs

@@ -21,6 +21,7 @@ pub use self::prometheus_exporter::*;
 
 /// We use the histogram buckets recommended by the OpenTelemetry specification
 /// https://github.com/open-telemetry/opentelemetry-specification/blob/main/specification/metrics/sdk.md#explicit-bucket-histogram-aggregation
+#[cfg(any(feature = "prometheus", feature = "prometheus-exporter"))]
 pub(crate) const HISTOGRAM_BUCKETS: [f64; 14] = [
     0.005, 0.01, 0.025, 0.05, 0.075, 0.1, 0.25, 0.5, 0.75, 1.0, 2.5, 5.0, 7.5, 10.0,
 ];

autometrics/src/tracker/prometheus.rs

@@ -1,6 +1,5 @@
 use crate::labels::{CounterLabels, GaugeLabels, HistogramLabels};
-use crate::HISTOGRAM_BUCKETS;
-use crate::{constants::*, tracker::TrackMetrics};
+use crate::{constants::*, tracker::TrackMetrics, HISTOGRAM_BUCKETS};
 use const_format::{formatcp, str_replace};
 use once_cell::sync::Lazy;
 use prometheus::histogram_opts;