dex: 🤌 add 1s, 5s buckets to DEX_PATH_SEARCH_RELAX_PATH_DURATION

this is a known source of latency. let's use some extra wide buckets to
capture any instances of additional >250ms latency.

crates/core/component/dex/src/component/metrics.rs

@@ -99,7 +99,14 @@ impl PrometheusBuilderExt for metrics_exporter_prometheus::PrometheusBuilder {
         )?
         .set_buckets_for_metric(
             Full(DEX_PATH_SEARCH_RELAX_PATH_DURATION.to_owned()),
-            GENERIC_DEX_BUCKETS,
+            {
+                // Add some larger buckets to the histogram tracking how long it takes to relax a
+                // path. See https://github.com/penumbra-zone/penumbra/issues/4464.
+                let mut buckets = GENERIC_DEX_BUCKETS.to_vec();
+                buckets.extend_from_slice(&[1.000, 5.000]);
+                buckets
+            }
+            .as_slice(),
         )?
         .set_buckets_for_metric(
             Full(DEX_ROUTE_FILL_DURATION.to_owned()),