feature: expand nym-node prometheus metrics (#5298)

* fixed bearer auth for prometheus route

* basic prometheus metrics

* added rates on global values

* improved structure on the prometheus metrics

* added additional metrics for ingress websockets and egress mixnet connections

* some channel business metrics

* fixed metrics registration and added additional variants

* added counter for number of disk persisted packets

* counter for pending egress packets

* counter for pending egress forward packets

* clippy

nym-node/src/node/http/state/metrics.rs

@@ -9,8 +9,6 @@ pub use nym_verloc::measurements::metrics::SharedVerlocStats;
 
 #[derive(Clone)]
 pub struct MetricsAppState {
-    pub(crate) prometheus_access_token: Option<String>,
-
     pub(crate) metrics: NymNodeMetrics,
 
     pub(crate) verloc: SharedVerlocStats,

nym-node/src/node/http/state/mod.rs

@@ -24,17 +24,7 @@ impl AppState {
             // does it have to be?
             // also no.
             startup_time: Instant::now(),
-            metrics: MetricsAppState {
-                prometheus_access_token: None,
-                metrics,
-                verloc,
-            },
+            metrics: MetricsAppState { metrics, verloc },
         }
     }
-
-    #[must_use]
-    pub fn with_metrics_key(mut self, bearer_token: impl Into<Option<String>>) -> Self {
-        self.metrics.prometheus_access_token = bearer_token.into();
-        self
-    }
 }