feat(ecstore): observe PUT commit lock admission

Co-Authored-By: heihutu <heihutu@gmail.com>

crates/obs/src/metrics/stats_collector.rs

@@ -337,7 +337,7 @@ fn timestamp_elapsed_seconds_since(now: Timestamp, earlier: Timestamp) -> u64 {
         return 0;
     }
 
-    u64::try_from(duration.as_secs()).map_or(u64::MAX, |seconds| seconds)
+    u64::try_from(duration.as_secs()).unwrap_or(u64::MAX)
 }
 
 fn scanner_scan_mode_code(scan_mode: &str) -> u64 {