fix(obs): label node-local metrics by server (#5465)

Add stable server labels to node-local Prometheus metrics and OTLP resource attributes so dashboards can distinguish per-node CPU, memory, host network, and internode traffic series.

Co-authored-by: heihutu <heihutu@gmail.com>

crates/obs/src/metrics/schema/system_network.rs

@@ -14,6 +14,7 @@
 
 #![allow(dead_code)]
 
+use crate::node_identity::SERVER_LABEL;
 use crate::{MetricDescriptor, MetricName, new_counter_md, new_gauge_md, subsystems};
 use std::sync::LazyLock;
 
@@ -22,7 +23,7 @@ pub static INTERNODE_ERRORS_TOTAL_MD: LazyLock<MetricDescriptor> = LazyLock::new
     new_counter_md(
         MetricName::InternodeErrorsTotal,
         "Total number of failed internode calls",
-        &[],
+        &[SERVER_LABEL],
         subsystems::SYSTEM_NETWORK_INTERNODE,
     )
 });
@@ -32,7 +33,7 @@ pub static INTERNODE_DIAL_ERRORS_TOTAL_MD: LazyLock<MetricDescriptor> = LazyLock
     new_counter_md(
         MetricName::InternodeDialErrorsTotal,
         "Total number of internode TCP dial timeouts and errors",
-        &[],
+        &[SERVER_LABEL],
         subsystems::SYSTEM_NETWORK_INTERNODE,
     )
 });
@@ -42,7 +43,7 @@ pub static INTERNODE_DIAL_AVG_TIME_NANOS_MD: LazyLock<MetricDescriptor> = LazyLo
     new_gauge_md(
         MetricName::InternodeDialAvgTimeNanos,
         "Average dial time of internode TCP calls in nanoseconds",
-        &[],
+        &[SERVER_LABEL],
         subsystems::SYSTEM_NETWORK_INTERNODE,
     )
 });
@@ -52,7 +53,7 @@ pub static INTERNODE_SENT_BYTES_TOTAL_MD: LazyLock<MetricDescriptor> = LazyLock:
     new_counter_md(
         MetricName::InternodeSentBytesTotal,
         "Total number of bytes sent to other peer nodes",
-        &[],
+        &[SERVER_LABEL],
         subsystems::SYSTEM_NETWORK_INTERNODE,
     )
 });
@@ -62,7 +63,7 @@ pub static INTERNODE_RECV_BYTES_TOTAL_MD: LazyLock<MetricDescriptor> = LazyLock:
     new_counter_md(
         MetricName::InternodeRecvBytesTotal,
         "Total number of bytes received from other peer nodes",
-        &[],
+        &[SERVER_LABEL],
         subsystems::SYSTEM_NETWORK_INTERNODE,
     )
 });