Corrections to prometheus entries. (#2470)

Author: MathieuDutSik

linera-views/src/backends/lru_caching.rs

@@ -15,7 +15,7 @@ use std::{
 
 use linked_hash_map::LinkedHashMap;
 #[cfg(with_metrics)]
-use prometheus::{register_int_counter_vec, IntCounterVec};
+use {linera_base::prometheus_util, prometheus::IntCounterVec};
 
 #[cfg(with_testing)]
 use crate::memory::MemoryStore;
@@ -30,14 +30,14 @@ use crate::{
 #[cfg(with_metrics)]
 /// The total number of cache faults
 static NUM_CACHE_FAULT: LazyLock<IntCounterVec> = LazyLock::new(|| {
-    register_int_counter_vec!("num_cache_fault", "Number of cache faults", &[])
+    prometheus_util::register_int_counter_vec("num_cache_fault", "Number of cache faults", &[])
         .expect("Counter creation should not fail")
 });
 
 #[cfg(with_metrics)]
 /// The total number of cache successes
 static NUM_CACHE_SUCCESS: LazyLock<IntCounterVec> = LazyLock::new(|| {
-    register_int_counter_vec!("num_cache_success", "Number of cache success", &[])
+    prometheus_util::register_int_counter_vec("num_cache_success", "Number of cache success", &[])
         .expect("Counter creation should not fail")
 });
 

linera-views/src/metrics.rs

@@ -18,9 +18,15 @@ pub fn increment_counter(counter: &LazyLock<IntCounterVec>, struct_name: &str, b
 /// The metric tracking the latency of the loading of views.
 #[doc(hidden)]
 pub static LOAD_VIEW_LATENCY: LazyLock<prometheus::HistogramVec> = LazyLock::new(|| {
-    use prometheus::register_histogram_vec;
-    register_histogram_vec!("load_view_latency", "Load view latency", &[])
-        .expect("Load view latency should not fail")
+    prometheus_util::register_histogram_vec(
+        "load_view_latency",
+        "Load view latency",
+        &[],
+        Some(vec![
+            0.001, 0.003, 0.01, 0.03, 0.1, 0.2, 0.3, 0.4, 0.5, 0.75, 1.0, 2.0, 5.0,
+        ]),
+    )
+    .expect("Load view latency should not fail")
 });
 
 /// The metric counting how often a view is read from storage.