fix: replace unwrap() with expect() in more files (#729 batch 13) (#3993)

crates/obs/src/global.rs

@@ -173,7 +173,7 @@ pub fn set_global_guard(guard: OtelGuard) -> Result<(), GlobalError> {
 ///
 /// # async fn trace_operation() -> Result<(), Box<dyn std::error::Error>> {
 /// #    let guard = get_global_guard()?;
-/// #    let _lock = guard.lock().unwrap();
+/// #    let _lock = guard.lock().expect("operation should succeed");
 /// #    // Perform traced operation
 /// #    Ok(())
 /// # }

crates/obs/src/metrics/collectors/system_gpu.rs

@@ -25,7 +25,7 @@
 //! use rustfs_obs::metrics::collectors::{GpuCollector, collect_gpu_metrics};
 //! use sysinfo::Pid;
 //!
-//! let pid = sysinfo::get_current_pid().unwrap();
+//! let pid = sysinfo::get_current_pid().expect("operation should succeed");
 //! let collector = GpuCollector::new(pid)?;
 //! let stats = collector.collect()?;
 //! let metrics = collect_gpu_metrics(&stats, &labels);
@@ -105,7 +105,7 @@ impl GpuCollector {
     /// use rustfs_obs::metrics::collectors::GpuCollector;
     /// use sysinfo::Pid;
     ///
-    /// let pid = sysinfo::get_current_pid().unwrap();
+    /// let pid = sysinfo::get_current_pid().expect("operation should succeed");
     /// let collector = GpuCollector::new(pid)?;
     /// ```
     pub fn new(pid: Pid) -> Result<Self, GpuError> {