fix(obs): shut down global telemetry guard (#4430)

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

rustfs/src/startup_entrypoint.rs

@@ -37,6 +37,7 @@ pub fn run_process() {
             // Tracing may not be initialized when startup fails this early.
             emit_fatal_stderr("Server runtime failed", e);
         }
+        let _ = crate::startup_runtime_sources::shutdown_observability_guard();
         std::process::exit(1);
     }
 }
@@ -59,6 +60,7 @@ async fn async_main() -> Result<()> {
         Ok(result) => result,
         Err(e) => {
             emit_fatal_stderr("Command parse failed", e);
+            let _ = crate::startup_runtime_sources::shutdown_observability_guard();
             std::process::exit(1);
         }
     };

rustfs/src/startup_lifecycle.rs

@@ -23,7 +23,7 @@ use crate::{
 use rustfs_common::GlobalReadiness;
 use rustfs_scanner::init_data_scanner;
 use std::{
-    io::Result,
+    io::{Error, Result},
     net::{IpAddr, Ipv4Addr, Ipv6Addr, SocketAddr},
     sync::{
         Arc,
@@ -149,6 +149,8 @@ pub(crate) async fn run_startup_runtime_lifecycle(lifecycle: StartupRuntimeLifec
         result = "stopped",
         "RustFS server stopped"
     );
+    startup_runtime_sources::shutdown_observability_guard()
+        .map_err(|err| Error::other(format!("shutdown_global_guard: {err}")))?;
     Ok(())
 }
 

rustfs/src/startup_runtime_sources.rs

@@ -66,6 +66,10 @@ pub(crate) fn set_observability_guard(guard: OtelGuard) -> Result<(), Observabil
     rustfs_obs::set_global_guard(guard)
 }
 
+pub(crate) fn shutdown_observability_guard() -> Result<(), ObservabilityError> {
+    rustfs_obs::shutdown_global_guard()
+}
+
 pub(crate) fn observability_metric_enabled() -> bool {
     rustfs_obs::observability_metric_enabled()
 }

rustfs/src/startup_shutdown.rs

@@ -18,6 +18,7 @@ use crate::{
     startup_optional_runtime_sidecars::{
         OptionalRuntimeServices, prepare_optional_runtime_shutdowns, shutdown_optional_runtime_services,
     },
+    startup_runtime_sources,
 };
 use rustfs_heal::shutdown_ahm_services;
 use rustfs_utils::get_env_bool_with_aliases;
@@ -299,6 +300,17 @@ pub(crate) async fn run_embedded_server_shutdown(
         state = "stopped",
         "Embedded server state changed"
     );
+
+    if let Err(err) = startup_runtime_sources::shutdown_observability_guard() {
+        warn!(
+            component = LOG_COMPONENT_EMBEDDED,
+            subsystem = LOG_SUBSYSTEM_EMBEDDED,
+            event = EVENT_EMBEDDED_SHUTDOWN_CLEANUP_FAILED,
+            service = "observability",
+            error = %err,
+            "Embedded shutdown cleanup failed"
+        );
+    }
 }
 
 #[cfg(test)]